Swollen Genitals (Infants)

Swollen genitals and enlarged breast tissue are common for newborn boys and girls.

Mothers experience a surge in estrogen as they prepare for delivery. At the same time, this estrogen passes the placenta to the baby. The excess estrogen in the baby’s body causes changes in genital appearance. These estrogen levels start to lower soon after the baby is born.

A baby girl’s swelling will decrease in a couple of weeks, but a baby boy’s swelling may take a few weeks to a few months before it goes away. It’s also common for girls to have a mucous discharge with streaks of blood from the vagina up to one week after birth.

Both newborn girls and boys may have lumps of tissue beneath their nipples, or their nipples might excrete a small amount of milky fluid. This milky fluid will stop and the breast tissue will shrink on its own during the first few weeks.

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Last updated: 2022-03-08