Jessica Hamilton, of Houston, was surprised when she first changed her daughter, Da'Tayvia. "Her vaginal area was puffed up like a balloon," says the mom of three. Before they left the hospital, she asked the doctor twice if something was wrong. Nope. Mom's hormones are still circulating through Baby's body in the first days, and this can cause swelling in boys' testicles, girls' labia, and breast tissue in both sexes. Genital puffiness subsides in a few days, and enlarged breasts shrink within a couple of months as maternal hormones in the body decrease, says Ramzan Shahid, M.D., assistant professor of pediatrics at Loyola University, in Maywood, Illinois.
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If your baby's breasts look red or tender or if genital swelling doesn't go down in a few days, it could be a sign of infection.