Lactation
Videos
Lactation describes the secretion of milk from the mammary glands in addition to the period of time that a parent lactates to feed her young. The process can occur with all sexually mature female mamm
Kittens nursing
Lactating Coyote, with noticeable teats
Collared Peccary nursing its young in the Parque de las Leyendas zoo
Milk secretion from a human breast
Breast
Videos
The breasts are two prominences located on the upper ventral region of the torso in humans and other primates. Both sexes develop breasts from the same embryological tissues. The relative size and dev
Lactation
…eighteenth week of pregnancy (the second and third trimesters), a woman's body produces hormones that stimulate the growth of the milk duct system in the breasts: Progesterone influences the growth in size of alveoli and lobes; high levels of progesterone inhibit lactation before birth. Progesterone levels drop…
Morphology of female human breasts, with the areola, nipple, intermammary cleft and inframammary fold
Male human breasts with defined pectoral muscles
Mountain gorilla breastfeeding an infant
Breast development in puberty is measured with the five-stage Tanner scale