Little Baby Girl Heart

An infant or baby is a child in the first year of life. After birth, a young human is naturally nourished with mother's milk, through breastfeeding or suckling at the female breast. Similar to the offspring of other mammals, the human infant is competent for this form of feeding through innate reflexes such as the search reflex and the sucking reflex. They also enable the intake of liquid food by sucking on a baby bottle and thus feeding with breast milk substitute when the infant is not breastfed.

The human infant, like that of other primates, is a gestational carrier. In the first year of life, there are typical developmental phases, the temporal dispersion of which increases with age. Temporary differences in development are common and can be compensated for. After three to five months, a healthy infant has doubled its birth weight and grown by about 15 centimetres. At the end of the first year of life, the child weighs about ten kilograms, which corresponds to about three times its birth weight, and is about 75 centimetres tall.