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Can Breastfeeding Reduce the Risk of Breast Cancer?

ditinjau oleh dr. Devi Elora - KALGen Academia Team

02 March 2026

Breastfeeding is widely recognized as the best way to provide optimal nutrition for infants. Breast milk contains antibodies, enzymes, and a natural nutritional composition designed to support healthy growth and development. But did you know that breastfeeding may also reduce a mother’s risk of breast cancer?

Various studies, including those from MD Anderson Cancer Center and Breastcancer.org, show that women who breastfeed have a lower risk of developing breast cancer and ovarian cancer compared to those who do not breastfeed. This article explains how this biological process works and how long breastfeeding is needed to obtain optimal benefits.

How Does Breastfeeding Reduce Breast Cancer Risk?

One of the main reasons breastfeeding lowers breast cancer risk is the hormonal changes that occur during lactation. When a mother breastfeeds, menstruation is often delayed after childbirth, resulting in reduced lifetime exposure to estrogen.

Estrogen is a hormone that can stimulate the growth of breast cancer cells. With lower estrogen exposure, the risk of abnormal cell growth also decreases.

In addition, during pregnancy and breastfeeding, the body naturally replaces breast tissue. This process helps eliminate cells that may potentially develop into cancer later in life.

Does Breastfeeding Reduce the Risk of Other Cancers?

Besides breast cancer, breastfeeding may also reduce the risk of ovarian cancer. Breastfeeding suppresses ovulation. The fewer times a woman ovulates, the lower her exposure to reproductive hormones, which reduces the likelihood of abnormal cell formation in the ovaries.

Several studies indicate that women who breastfeed for longer durations have a lower risk of ovarian cancer compared to those who breastfeed for a shorter period or not at all.

How Long Should You Breastfeed to Gain the Protective Benefits?

The World Health Organization (WHO) recommends exclusive breastfeeding for at least six months. This means the baby receives only breast milk, without additional food, water, or other liquids. After six months, complementary foods can be introduced, while breastfeeding continues.

Research suggests that:

Every 12 months of breastfeeding may reduce breast cancer risk by approximately 4%
Longer breastfeeding duration provides greater protection
The cumulative duration of breastfeeding across multiple children continues to offer protective effects

What If You Are Unable to Breastfeed?

Breastfeeding offers important benefits for both mother and baby, but it is not always easy or possible. If you experience difficulties, many healthcare professionals and lactation consultants can provide support. However, if breastfeeding is not an option, there is no need to feel guilty.

There are many other ways to lower breast cancer risk, including:

Staying physically active
Maintaining a healthy body weight
Limiting alcohol consumption
Following a balanced and nutritious diet

Breastfeeding is one protective factor, but an overall healthy lifestyle remains the cornerstone of cancer prevention.

Conclusion

Breastfeeding not only benefits infant growth and development but also plays a role in reducing the risk of breast and ovarian cancer in mothers. Hormonal changes, reduced lifetime estrogen exposure, and breast tissue regeneration are key factors behind this protective effect.

However, breastfeeding should be viewed as an added health benefit rather than an obligation that creates pressure. A combination of a healthy lifestyle and early detection remains the most effective strategy for cancer prevention.

Early Detection for Peace of Mind

Through breast cancer screening services at KALGen Innolab, you can gain a more personalized understanding of your biological condition and breast cancer risk using modern molecular and genomic approaches. With comprehensive results, doctors can provide prevention or management recommendations tailored to your individual risk profile.

Because when detection happens early, the chances of recovery and quality of life are significantly improved.

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