What are the deposits of fat trapped in pockets underneath skin my baby?

The deposits of fat trapped in pockets underneath the skin of a newborn baby are called vernix caseosa. Vernix caseosa is a waxy, whitish substance that covers the baby's skin during the last trimester of pregnancy and at birth. It is composed of sebum, dead skin cells, and amniotic fluid, and it serves to protect the baby's skin from the harsh environment of the womb. After birth, vernix caseosa gradually disappears as the baby's skin dries and begins to produce its own oils.