Why My Right Breast Is Bigger Than Left In Pregnancy


My Right Breast is Bigger than Left During Pregnancy: Reasons Explained

It’s normal for a woman’s breasts to grow in size during pregnancy. You may find that one breast is slightly larger than the other, and this is perfectly natural. It’s not uncommon for pregnant women to experience disproportionately larger right breasts, and here’s why:

The Ligaments Supporting Your Breasts Change During Pregnancy

The Cooper’s ligaments are strong bands of tissue that support and hold the structure of the breasts. As your breasts swell with more volume during pregnancy, these ligaments don’t always expand evenly. This means that one breast may expand more than the other, causing the difference in size between them.

Differing Milk Supplies

Both breasts will make a supply of breastmilk, but it’s not unusual for one to produce more than the other. This could be because the corresponding mammary gland or ducts of the breast are larger or more efficient, or simply because your baby prefers it!



Variations in Breast Density

Breasts can come in all shapes and sizes, and the two sides can differ in density. Some women will have breasts that are denser on one side than the other, causing the difference in size.

Hormonal Changes

The female body goes through a massive transformation during pregnancy, and hormones, such as oestrogen and progesterone, play an important role in this. While no definitive proof exists as to why these hormones cause disproportionately larger right breasts, it is thought that they may play a role in stimulating the mammary glands on one side more than the other.

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Overall, the difference in size between your right and left breast during pregnancy is completely normal, and these changes aren’t anything to worry about. Many pregnant women experience different-sized breasts, and it’s perfectly possible that they’ll even out post-pregnancy.

  • Takeaway points:
  • It is normal for a woman’s breasts to grow unevenly during pregnancy.
  • The Cooper’s ligaments expand differently and can cause one breast to grow more than the other.
  • Disproportionate milk supply, different breast density and hormonal changes can also contribute to the difference in size.
  • These differences eventually correct themselves post-pregnancy.


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