Formula feeding and complementary feeding

Overview & Definition

When breast milk is not available, not enough, or not chosen, the question for the clinician is deceptively simple: what do you feed the baby, how do you make it safely, and when do you start real food? Infant formula is a manufactured feed designed to be nutritionally complete for the first months of life, regulated to a strict compositional standard so that a healthy infant can grow on it alone [7]. Complementary feeding — the older term is weaning — is the progressive introduction of foods other than milk from around six months, building toward a child who eats the family diet by their first birthday [1].

The two halves of this topic share one goal: to supply enough energy, protein, iron, zinc and micronutrients for rapid infant growth without overwhelming an immature gut and kidney. Breastfeeding remains the reference standard and is recommended as the sole milk source for the first six months, continuing alongside foods to twelve months and beyond [3][4]. Where formula is used, the principles of choice, volume, preparation and progression are the everyday work of a general paediatrician, and the source of most parental questions in the first year [1][2].

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2. [2]Agostoni C; Decsi T; Fewtrell M; Goulet O; Kolacek S; Koletzko B; et al Complementary feeding: a commentary by the ESPGHAN Committee on Nutrition. J Pediatr Gastroenterol Nutr, 2008.PMID 18162844
3. [3]Kramer MS; Kakuma R Optimal duration of exclusive breastfeeding. Cochrane Database Syst Rev, 2012.PMID 22895934
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10. [10]Tsai SF; Chen SJ; Yen HJ; Hung GY; Tsao PC; Jeng MJ; et al Iron deficiency anemia in predominantly breastfed young children. Pediatr Neonatol, 2014.PMID 24953965
11. [11]Yadav B; Gupta N; Sasidharan R; Thanigainathan S; Purohit P; Singh K; et al 800 IU versus 400 IU per day of vitamin D(3) in term breastfed infants: a randomized controlled trial from an LMIC. Eur J Pediatr, 2022.PMID 35726033