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Can Breastfeeding Cause Nutrient Deficiencies? What New Mothers Should Know

ByShivangi Sarkar
Updated: 7 Aug 2026, 2:10 pm

Breastfeeding can increase nutritional demands, making maternal nutrition an important part of postnatal care. Deficiencies in nutrients such as vitamin D, vitamin B12, iron, folate and iodine may occur in some women. Understanding risk factors, symptoms and appropriate blood tests can help identify deficiencies and guide personalised treatment when needed.

Pregatips
The nutritional needs of a new mother do not end after childbirth. Breastfeeding places additional demands on the body, while recovery from pregnancy and delivery can make adequate nutrition more challenging. Although breast milk provides the nutrients a growing baby needs, maternal nutritional status still matters for the mother’s health and, for some nutrients, the composition of breast milk.
In this article:
This World Breastfeeding Week (August 1 to 7), we spoke to a doctor to understand nutrient deficiencies better. According to Dr Moumita Misra, Head – Lab Operations (Mumbai), Metropolis Healthcare Limited, “Breastfeeding increases a mother's nutritional demands, making adequate vitamin and mineral levels essential for both maternal health and optimal infant nutrition.”


Common Nutrient Deficiencies During Breastfeeding

Some nutrients deserve particular attention during the breastfeeding period, including:

  • Vitamin D
  • Vitamin B12
  • Iron
  • Folate
  • Iodine
The risk is not the same for every woman. Dietary restrictions, certain medical conditions, previous nutritional deficiencies and limited intake of nutrient-rich foods can influence individual requirements.

Dr Misra explains that identifying nutritional gaps early can help clinicians provide appropriate, individualised care rather than relying solely on symptoms.



How Are Nutrient Deficiencies Diagnosed?

Symptoms such as persistent fatigue, weakness or other changes may have several possible causes after childbirth, so testing should be guided by a healthcare professional.

Depending on a woman’s history and clinical assessment, investigations may include:

  • Complete blood count (CBC) to assess blood cell counts and anaemia
  • Serum ferritin to assess iron stores
  • Vitamin B12 and folate testing
  • 25-hydroxy vitamin D testing
  • Thyroid profile when clinically indicated
For iron deficiency, ferritin is an important measure of iron stores, although inflammation can affect its interpretation.

Dr Misra advises that laboratory testing can provide a clearer picture of nutritional status and help healthcare professionals decide whether supplementation or further evaluation is appropriate.


Why Timely Testing Matters

Detecting a deficiency allows treatment to be tailored to the individual rather than relying on unnecessary supplementation. For example, vitamin B12 status can sometimes require additional testing when blood levels are borderline.

Nutritional care should remain part of a mother’s postnatal health, particularly while breastfeeding. If deficiency is suspected, speaking to a healthcare professional and using appropriate laboratory testing can help identify the underlying issue and support timely, targeted care.


FAQs on Nutrient Deficiencies Common In Breastfeeding Mothers

  1. What nutrient deficiencies are common during breastfeeding?
    Vitamin D, vitamin B12, iron, folate and iodine may require attention, depending on individual diet, health and nutritional status.
  2. Which tests can identify nutrient deficiencies?
    Depending on clinical needs, testing may include a CBC, ferritin, vitamin B12, folate, 25-hydroxy vitamin D and thyroid profile.

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