There are recommendations to guide parents to help their infants make the transition from milk to weaning foods, but they differ in their focus in developed or developing countries and on the physiological and behavioural reasons that underlie the introduction of weaning foods. According to recommendations, ideally, term infants should begin weaning at six months, while breastfeeding should continue for two years. The recommendations on nutrients in complementary foods are based on the nutrient gap between the composition and volume of breast milk after approximately six months of exclusive breastfeeding and the physiology of infant nutritional requirements.