Navigating Postpartum Fasting: Tips for Nursing Moms
Updated: Jul 15
Fasting during the postpartum period can be challenging for nursing mothers. Balancing the demands of nourishing a newborn while fasting requires careful preparation. This post explores how fasting affects nursing, offers practical advice, and highlights important factors to keep both mother and baby healthy during this time.
Understanding Fasting and Nursing
Even if you're feeling well, your body is still healing from pregnancy and birth while also producing nourishment for another human being. During this time period, your nutritional needs are higher, not lower.
The good news? If you do need to fast for a short period, the available research is generally reassuring. But there are a few important considerations.
Effects of Fasting on Milk Supply
Studies looking at short-term fasting have found that the overall nutritional quality of breast milk remains remarkably stable. The body prioritizes milk production, often using stored energy and fat reserves to compensate. Some vitamins and minerals may fluctuate temporarily, but your body does an amazing job of protecting your milk for your baby. However, prolonged fasting (longer than 1 day) or repeated fasting days may lead to decreased milk volume and changes in milk composition.
Hydration and Nutritional Needs
Hydration is critical for nursing mothers. Dehydration can reduce milk supply and cause maternal fatigue. When approaching a fast, mothers should:
Drink plenty of water prior to the start of the fast (see below for more information regarding water vs electrolyte drinks*)
Consume nutrient-dense foods rich in protein, healthy fats, vitamins, and minerals
Avoid excessive caffeine or sugary drinks that may dehydrate
Eating balanced meals before and after fasting helps maintain energy levels and supports milk production.
Practical Tips for Nursing Moms Who Fast
Feeding schedules
Nurse before fasting as normal to ensure the baby has enough milk. Continue feeding throughout the fast to maintain supply.
Prioritize rest
Minimize movement as much as you can and consider having someone else help with taking care of the baby. Refrain from going outdoors in the heat and remain inside with air conditioning or a fan.
Monitor your baby closely
Watch for signs of dehydration or hunger in your baby, such as fewer wet diapers, lethargy, and persistent crying as this may be an indication your baby is not receiving enough milk.
Seek support from healthcare providers
If you have specific medical concerns, or concerns about milk supply, discuss your fasting plans with a lactation consultant or doctor.
Listen to your body
If you feel weak, dizzy, or nauseous, reach out to your rabbi.
Addressing Common Concerns
Will fasting harm my baby?
Short fasts generally do not harm healthy, full-term infants. Breast milk composition adapts to meet the baby’s needs. However, if the baby is premature, has health issues, or shows signs of poor feeding, consult a rabbi and healthcare professional.
Can I continue nursing if I am fasting?
Absolutely. Occasional missed meals or fasting days are usually manageable. Consistent poor nutrition or dehydration can reduce milk supply over time.
What will happen to my milk supply if I substitute one feed with a bottle?
Replacing a single nursing session with formula during a fast is unlikely to have a meaningful impact on your long-term milk supply, provided nursing resumes as usual afterward.
Summary
Fasting while nursing during the postpartum period requires thoughtful planning and attention to both mother and baby’s needs. Short-term fasting is often safe for healthy mothers and infants, but hydration, nutrition, and monitoring are essential.
Taking care of yourself supports your baby’s health and your nursing journey. If you are considering fasting, prepare well, stay informed, and prioritize your well-being.
*A Note on Hydration
For a healthy adult getting ready for a planned 25-hour fast, there is no evidence suggesting that drinking electrolyte beverages is better than plain water, unless you have a specific reason for significant electrolyte loss (such as heavy sweating, vomiting/diarrhea, taking certain medications, or engaging in intense exercise). If you are well-hydrated before starting the fast, you should be able to keep your electrolytes within normal range for 25 hours.
Electrolyte drinks have not been proven to enhance milk production or prevent a decrease in milk supply during a brief fast. If you do decide to drink electrolyte beverages, select ones that are low in sugar or sugar-free.
This post provides general information and is not a substitute for professional medical advice. Consult your healthcare provider before starting or continuing fasting while nursing.
Resources:
Academy of Breastfeeding Medicine. Clinical Protocol #8
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