Skip to content

Health & Baby

Font Size

Breast Lumps in Your Newborn Baby

It's normal for babies (boys and girls) to have mild or even swollen, enlarged breasts and/or lumps under the nipple. They are almost always benign and due to exposure to maternal hormones in the womb. The same hormones that cause the mother's breasts to swell and milk glands to be stimulated can do the same to the baby's breasts.

These lumps and enlarged breasts in the baby may be quite noticeable at birth. They might even continue to grow after birth for a while. If you were to pinch them, some real breast milk may be expressed.

Over weeks, or sometimes even months, when there is no more exposure to the hormones, the breast tissue begins to shrink and eventually becomes quite flat. Occasionally a normal, small amount of tissue remains, but it doesn't grow or cause discomfort.

Tips for Concerned Parents

Sometimes, overly worried parents touch and pinch the breasts so much that the area gets irritated. Leave them alone and let nature take its course in shrinking them.

When to Worry About Swollen Breasts or Lumps

In the rare case when the breasts look infected (swollen, red, tender, or have a discharge) and the baby has a fever, call your pediatric provider to check if an infection has set in.

WebMD Medical Reference

Reviewed by Roy Benaroch, MD on June 07, 2015

Today on WebMD

mother on phone holding baby
When you should call 911.
parents and baby
Unexpected ways your life will change.
baby acne
What’s normal – and what’s not.
baby asleep on moms shoulder
Help your baby get the sleep he needs.

mother holding baby at night
mother with sick child
Chinese mother breast feeding newborn baby girl
Track Your Babys Vaccines
Baby Napping 10 Dos And Donts
Woman holding feet up to camera
Father kissing newborn baby
baby gear slideshow