The milk released near the end of a breastfeeding, after active let-down of milk. Fat content of hindmilk is higher, two or three times the concentration in foremilk. Hindmilk provides important calories for a breastfeeding baby.

The milk a baby gets after the first few minutes of nursing; it’s lower in volume, but higher in calories and fat

Breast milk, rich in fat, produced toward the end of a feeding. A baby must nurse for a while (there is no set time -- it varies with the individual) to get the hindmilk.