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Lump in Baby's Breast

Baby Madeline

This page deals with the causes of a lump in a baby's breast and a lump in the breast of a toddler. It answers the common question many mothers have - "why has my baby got boobs?"

What causes a lump in a baby's breast?

It is common for babies (both boys and girls) to have breasts especially after birth. They are caused by the hormones that you have that are passed to your baby in the final stages of labor. As the hormone levels return to normal, the breasts will reduce in size.

How long will the breast lumps remain?

It depends. Most are gone in a few weeks. Babies who are breast fed my have breasts for longer. Occasionally, a small lump will persist. As long as the skin over the lump looks normal there is nothing to worry about.

Is it normal for babies with breasts to have milk?

The same hormones that cause the breast development may also cause a discharge that can look like milk. It is called "witches milk". Don't worry, this is normal for some babies.

Are lumps in baby's breasts dangerous?

No, a lump in baby breast is usually quite benign and is not cancer or anything else to worry about.

Can breast lumps become infected?

Yes. See your doctor if:

  • the skin over the lump becomes red or warm
  • your baby is unwell

What can I do if my baby has a breast lump?

You don't need to do anything. The lump will go by itself. Don't be tempted to squeeze the breasts. Just leave them alone.

Toddler breast lump

What causes a breast lump in a toddler?

Children can get breast cysts. These feel like firm (but not too hard) lumps behind the nipple. They are filled with fluid and are usually benign. Cancer of the breast is very rare in children.

The breast cyst will usually disappear by itself but this may take months to years. Occasionally, a breast cyst will get infected.

See your doctor if:

  • the skin over the lump becomes red or warm
  • there is discharge from the breast
  • your toddler is unwell


To go to the top of the Lump in Baby Breast page, click here

To go to the Newborn Baby page, click here

To return to the Home page, click here


Last reviewed 2 March 2007

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