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The use of linear programming (LP) to develop complementary food recommendations (CFRs) is gaining interest due to its ability to produce low-cost population-specific food-based recommendations (FBRs). This review aimed to identify the components of LP models commonly used in developing CFRs and summarize the evidence on the use of LP-developed CFRs as an intervention strategy. The databases PubMed, Science Direct, Scopus, Cochrane Library, Web of Science, and Google Scholar were searched for relevant articles. LP was used in twenty-six studies to develop CFRs for young children and in three studies LP-developed CFRs were applied to improving complementary feeding. The objective function varied across studies, such as to maximize nutrient content, minimize cost, minimize deviation between observed and modeled diets, and minimize multiple nutrient deficiencies. All studies applied nutritional and acceptability constraints. Individual intervention studies showed that LP-developed CFRs can improve children’s nutrient intake and feeding practices, as well as mother’s nutrition knowledge. Various applications of LP have been used to develop optimal infant diets. However, LP-developed CFRs as a nutrition intervention strategy have been used in only a few studies. Further robust research is needed to test LP-developed CFRs. •LP is a valuable tool for developing complementary feeding recommendations (CFRs).•Maximizing nutrient content is the most common objective function to develop CFRs.•All studies applied nutritional and acceptability constraints for feasible CFRs.•There were limited studies exploring the effectiveness of LP-developed CFRs.•LP-developed CFRs can improve children’s nutrient intake and feeding practices.

To explore complementary feeding practices and identify potential risk factors associated with inadequate complementary feeding practices in Ghana by using the newly developed WHO infant feeding indicators and data from the nationally representative 2008 Ghana Demographic and Health Survey. The source of data for the analysis was the 2008 Ghana Demographic and Health Survey. Analysis of the factors associated with inadequate complementary feeding, using individual-, household- and community-level determinants, was done by performing multiple logistic regression modelling. Ghana. Children (n 822) aged 6-23 months. The prevalence of the introduction of solid, semi-solid or soft foods among infants aged 6-8 months was 72.6 % (95 % CI 64.6 %, 79.3 %). The proportion of children aged 6-23 months who met the minimum meal frequency and dietary diversity for breast-fed and non-breast-fed children was 46.0 % (95 % CI 42.3 %, 49.9 %) and 51.4 % (95 % CI 47.4 %, 55.3 %) respectively and the prevalence of minimum acceptable diet for breast-fed children was 29.9 % (95 % CI 26.1 %, 34.1 %). Multivariate analysis revealed that children from the other administrative regions were less likely to meet minimum dietary diversity, meal frequency and acceptable diet than those from the Volta region. Household poverty, children whose mothers perceived their size to be smaller than average and children who were delivered at home were significantly less likely to meet the minimum dietary diversity requirement; and children whose mothers did not have any postnatal check-ups were significantly less likely to meet the requirement for minimum acceptable diet. Complementary feeding was significantly lower in infants from illiterate mothers (adjusted OR=3.55; 95 % CI 1.05, 12.02). The prevalence of complementary feeding among children in Ghana is still below the WHO-recommended standard of 90 % coverage. Non-attendance of postnatal check-up by mothers, cultural beliefs and habits, household poverty, home delivery of babies and non-Christian mothers were the most important risk factors for inadequate complementary feeding practices. Therefore, nutrition educational interventions to improve complementary feeding practices should target these factors in order to achieve the fourth Millennium Development Goal.

The aim of this study was to review the factors associated with stunting in the northern province of Rwanda by assessing anthropometric status, dietary intake, and overall complementary feeding practices. This was a cross-sectional study with 138 children 5 to 30 mo of age. A structured questionnaire was used to collect information on sociodemographic characteristics of each mother and child and breastfeeding and complementary feeding practices. Anthropometric status was assessed using height-for-age z-scores for children and body mass index for caregivers. Dietary intakes were estimated using a 24-h recall. Multiple linear and logistic regression models were performed to study the predictors of height-for-age z scores and stunting. There was a 42% stunting prevalence. Prevalence of continued breastfeeding and exclusive breastfeeding were 92% and 50%, respectively. Most children (62%) fell into the low dietary diversity score group. The nutrient intake from complementary foods was below recommendations. The odds of stunting were higher in children >12 mo of age (odds ratio [OR], 1.18; 95% confidence interval [CI], 1.08–1.29). Exclusive breastfeeding (OR, 0.22; 95% CI, 0.10–0.48) and deworming tablet use in the previous 6 mo (OR, 0.25; 95% CI, 0.07–0.80) decreased significantly the odds of stunting in children. Also, the body mass index of the caretaker (β = 0.08 kg/m2; 95% CI, 0.00–0.17) and dietary zinc intake (β = 1.89 mg/d; 95% CI, 0.29–3.49) were positively associated with the height-for-age z scores. Interventions focusing on optimal nutrition during the complementary feeding stage, exclusive breastfeeding, and the use of deworming tablets have the potential to substantially reduce stunting in children in the northern province of Rwanda.

Early nutrition plays a crucial role not only in providing essential nutrients for proper child development, but may also be an important step in creating desirable eating behaviors, which can be transmitted into adulthood. The aim of this study was to assess possible links between early feeding factors, such as breastfeeding, complementary feeding (timing and method) as well as types of complementary foods and mealtime environment during the first three months of complementary feeding and eating behaviors in children aged 1–3 years old. This cross-sectional, online survey involved 467 mothers of toddlers aged 1–3 years old from the whole of Poland. The questionnaire consisted of questions about early feeding and the Children’s Eating Behavior Questionnaire (CEBQ). The adjusted linear regression model revealed that longer duration of any breastfeeding was negatively related to enjoyment of food (EF), desire to drink (DD) and positively related to satiety responsiveness (SR) and slowness in eating (SE) subscales. Moreover, offering homemade complementary foods more often than commercial may be related to higher SR. Eating meals during distraction seems to be negatively associated with EF, and positively with DD and SE subscales. Our study highlights possible links between early feeding factors and toddlers’ eating behaviors, so further investigation, also including dietary factors, is needed.

Although recommended infant and young child feeding (IYCF) practices have been found to be protective against undernutrition in some settings, there is no finality yet due to inconsistencies in the literature. A cross-sectional survey of 581 mother-child pairs was conducted in northern Ghana in June 2018. The association between IYCF indicators and child undernutrition (stunting and wasting) were assessed. The descriptive analysis showed that 66.4% of the children (6–23 months) were introduced to complementary feeding in a timely manner, 69.4% met the minimum meal frequency, and 38.9% met the minimum acceptable diet daily. The prevalence of stunting, wasting, underweight and overweight was 33.2%, 14.1%, 27% and 2.6%, respectively. From the multivariable binary logistic regression, child gender, child age group and source of power for lighting the household were significantly associated with wasting. Intake of iron-rich foods, child age group, and maternal height were significantly associated with stunting after adjusting for confounders. The prevalence of the compliance with IYCF indicators was relatively high. None of the individual IYCF indicators showed significant association with undernutrition, except intake of iron-rich foods for stunting. Nutrition-specific interventions targeted at improving IYCF practices, dietary diversification and intake of nutrient-rich meals, should be adopted and scaled up to address undernutrition in northern Ghana.

Infant and young child feeding (IYCF) practices are influenced by many context‐specific factors related to local food systems as well as social and cultural practices. Understanding these local contextual perspectives is essential for designing effective programs and policies. This paper uses focused ethnographic study methods to examine challenges experienced by mothers related to IYCF in two counties in Kenya, a country with considerable heterogeneity in agriculture, food systems, and cultures. A two‐phase qualitative study was undertaken in each of Kilifi County and West Pokot County, entailing interviews and rating activities with mothers, health workers, and vendors. Interviews were audio‐recorded, transcribed, translated into English, coded, and analysed by topic. Results show low levels of dietary diversity in both counties; in West Pokot, the level of adequate meal frequency is also low. Core foods in young child diets included maize porridge and family foods such as ugali (stiff maize porridge), vegetables, beans, fish, and plantains. Food safety, acceptability, and acquisition ease were the main drivers of food choice. Mothers generally felt that all core foods fed to young children are healthy and safe, but there was more variability regarding child acceptance, acquisition ease, cost, and convenience. Common barriers to feeding nutrient‐dense foods to children included child illness, economic constraints, and limited knowledge of modification strategies, skills, or tools to make the foods suitable for young children. Potential actions to address these barriers include sharing information on child‐appropriate recipes; raising awareness on local, affordable nutrient‐dense foods; and improving WASH practices to reduce illness frequency. This rating of caregivers' impressions of dishes and food items for young children in Kilifi and West Pokot counties indicates that most foods were rated well for healthiness and food safety. There is greater variation for acceptance and acquisition, and particularly for cost and convenience. Key points Children experience low levels of dietary diversity in Kenya's Kilifi and West Pokot counties; in West Pokot country, low meal frequency is also an issue. Core foods in young child diets included maize porridge and family foods like ugali, vegetables, beans, fish, and plantains. Food safety, acceptability, and ease of acquisition were the main drivers of food choice. Barriers to giving nutrient‐dense foods were illness, economic constraints, and mothers’ knowledge of food modification strategies. Sharing child‐appropriate recipes and information on affordable nutrient‐dense foods could help lower barriers.

Appropriate complementary feeding (CoF) is the key to preventing childhood obesity and promoting long-term health. Parents must be properly informed through the CoF process. Pediatricians have opportunities to interact with parents during the CoF transition and influence parental feeding decisions. They can convey public health nutrition messages to parents. With the release of new CoF recommendations in France in 2019, and from the perspective of their conversion into official public health communication material, the aim of this study was to explore parents’ and pediatricians’ perceptions and needs regarding information on CoF. Two online surveys were disseminated to gather information on CoF communication and guidance: one for parents (n = 1001, January 2020); one for pediatricians (n = 301, October 2019). The results showed that the importance of CoF for children’s healthy growth was well recognized by both parents and pediatricians. Parents acknowledged pediatricians as the most influential source of advice; and pediatricians were aware of their responsibility in counselling parents on CoF. However, pediatricians neglected the fact that parents gave high trust to their personal network when looking for advice. The Internet was a well-recognized source of information according to all. Diverging from what pediatricians considered useful, parents were interested in practical advice for implementing CoF. This study highlights common expectations and points of divergence between parents’ needs and pediatricians’ perceptions of those needs with regard to CoF information.

Poor feeding practices result in inadequate nutrient intakes in young children in developing countries. To improve practices, local food-based complementary feeding recommendations (CFR) are needed. This cross-sectional survey aimed to describe current food consumption patterns of 12–23-month-old Myanmar children (n 106) from Ayeyarwady region in order to identify nutrient requirements that are difficult to achieve using local foods and to formulate affordable and realistic CFR to improve dietary adequacy. Weekly food consumption patterns were assessed using a 12-h weighed dietary record, single 24-h recall and a 5-d food record. Food costs were estimated by market surveys. CFR were formulated by linear programming analysis using WHO Optifood software and evaluated among mothers (n 20) using trial of improved practices (TIP). Findings showed that Ca, Zn, niacin, folate and Fe were ‘problem nutrients’: nutrients that did not achieve 100 % recommended nutrient intake even when the diet was optimised. Chicken liver, anchovy and roselle leaves were locally available nutrient-dense foods that would fill these nutrient gaps. The final set of six CFR would ensure dietary adequacy for five of twelve nutrients at a minimal cost of 271 kyats/d (based on the exchange rate of 900 kyats/USD at the time of data collection: 3rd quarter of 2012), but inadequacies remained for niacin, folate, thiamin, Fe, Zn, Ca and vitamin B6. TIP showed that mothers believed liver and vegetables would cause worms and diarrhoea, but these beliefs could be overcome to successfully promote liver consumption. Therefore, an acceptable set of CFR were developed to improve the dietary practices of 12–23-month-old Myanmar children using locally available foods. Alternative interventions such as fortification, however, are still needed to ensure dietary adequacy of all nutrients.

Inadequate nutrient intake as part of a complementary feeding diet is attributable to poor feeding practices and poor access to nutritious foods. Household socio-economic situation (SES) has an influence on food expenditure and access to locally available, nutrient-dense foods and fortified foods. This study aimed to develop and compare complementary feeding recommendations (CFR) for 12–23-month-old children in different SES and evaluate the contribution of fortified foods in meeting nutrient requirements. A cross-sectional survey was conducted in low and medium SES households (n 114/group) in urban Bandung district, West Java province, Indonesia. Food pattern, portion size and affordability were assessed, and CFR were developed for the low SES (LSES) and middle SES (MSES) using a linear programming (LP) approach; two models – with and without fortified foods – were run using LP, and the contribution of fortified foods in the final CFR was identified. Milk products, fortified biscuits and manufactured infant cereals were the most locally available and consumed fortified foods in the market. With the inclusion of fortified foods, problem nutrients were thiamin in LSES and folate and thiamin in MSES groups. Without fortified foods, more problem nutrients were identified in LSES, that is, Ca, Fe, Zn, niacin and thiamin. As MSES consumed more fortified foods, removing fortified foods was not possible, because most of the micronutrient-dense foods were removed from their food basket. There were comparable nutrient adequacy and problem nutrients between LSES and MSES when fortified foods were included. Exclusion of fortified foods in LSES was associated with more problem nutrients in the complementary feeding diet.

Optimal complementary feeding between the ages of 6 and 23 months provides children with the required range of nutritious and safe foods while continuing to be breastfed to meet their needs for essential nutrients and develop their full physical and cognitive potential. The rates of exclusive breastfeeding in the first 6 months of life have increased from 32% in 2008 to 60% in 2022 in Kenya. However, the proportion of children between 6 and 23 months receiving a minimum acceptable diet remains low and has declined from 39% in 2008 to 31% in 2023. The Kenyan Ministry of Health, GAIN and UNICEF collaborated to understand the drivers of complementary feeding practices, particularly proximal determinants, which can be directly addressed and acted upon. A secondary analysis of household surveys and food composition data was conducted to outline children's dietary patterns within the different regions of Kenya and the extent to which the affordability of animal‐source foods could be improved. Ethnographic data were analyzed to identify socio‐cultural barriers to optimal complementary feeding. Furthermore, we outlined the critical steps for developing user‐friendly and low‐cost complementary feeding recipes. The results of all the analyses are presented in five of the six papers of this Special Issue with this additional paper introducing the Kenyan context and some of the critical findings. The Special Issue has highlighted multidimensional barriers surrounding the use and availability of animal‐source foods. Furthermore, it emphasizes the need for a multi‐sectoral approach in enacting policies and programmes that address these barriers. Key messages In most low‐income countries, including Kenya, just over a quarter of the young children receive a nutritionally adequate diet during the complementary feeding period, 6–23 months. Some global investments have been made to promote breastfeeding. However, efforts to improve the complementary feeding diet for young children still lag behind. The drivers for the persistent nutritionally poor quality of complementary feeding diets lie in broader contextual issues in these three key areas: Food environment, which includes a milieu of climatic, economic factors; Services in WASH, Social Protection, Education, which shape a conducive environment; and Socio‐norms on feeding practices.