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Infant Formula and Constipation: How to Keep Your Baby Comfortable

Medically Reviewed by May Zhu, RDN | Published January 16, 2025

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Constipation in infants can be distressing for both babies and parents. Formula-fed babies may experience this issue more often than breastfed infants due to differences in digestion and stool consistency.

Understanding the causes and identifying gentle remedies can help keep your baby comfortable and promote healthy digestion.

What Causes Formula-Related Constipation?

Formula-fed babies may be more prone to constipation because infant formula is often harder to digest than breast milk. Formula lacks certain components like human milk oligosaccharides (HMOs), which act as prebiotics and encourage the growth of beneficial gut bacteria.

Studies show that breast milk’s unique composition results in softer, more frequent stools compared to formula-fed infants (Bode, 2015).

Additionally, some formulas, particularly those with high levels of casein protein or iron, can contribute to harder, less frequent stools.

If your baby is straining to poop or producing hard, pellet-like stools, it could be a sign of constipation.

Signs of Constipation in Formula-Fed Babies

Look out for these signs if you suspect your baby is constipated:

  • Hard, dry stools resembling small pellets

  • Straining or crying during bowel movements

  • Fewer than three bowel movements per week

  • A firm, bloated belly

It’s important to remember that occasional difficulty pooping is normal, but persistent symptoms warrant a discussion with your pediatrician.

Tips to Relieve Formula-Related Constipation

  1. Switch to a Different Formula
    If your baby frequently struggles with constipation, consider switching to a formula designed to support digestive health.Formulas with added prebiotics or partially hydrolyzed proteins may improve stool consistency and gut health. Studies show that formulas enriched with HMOs or probiotics likeBifidobacterium can significantly reduce constipation (Elison et al., 2016).

  2. Offer Adequate Hydration
    Ensure your baby is getting enough fluids, especially if they’ve started solids. For infants younger than six months, formula or breast milk should provide all the hydration they need. Once your baby is six months old or older, a small amount of water may be introduced with your pediatrician’s guidance.

  3. Incorporate Gentle Tummy Massage
    Tummy massages can help stimulate your baby’s digestive system and encourage bowel movements. Use gentle, circular motions with your fingertips around your baby’s bellybutton to promote relief.

  4. Try Bicycle Leg Exercises
    Moving your baby’s legs in a bicycle motion can also aid digestion and alleviate constipation. Lay your baby on their back and gently guide their legs through the cycling motion to help stimulate their bowels.

  5. Consider Prebiotics and Probiotics 
    Prebiotics and probiotics formulated for infants, such as Beginbaby Prebiotic + Probiotics may help balance gut bacteria and improve digestion. Probiotics, such asBifidobacterium Lactis or B. Infantis can help with digestive balance and support regular bowel movements (Underwood et al., 2019). Always consult your pediatrician before starting supplements.

When to See a Doctor

If your baby’s constipation persists despite trying these remedies, or if they develop symptoms like blood in their stool, vomiting, or severe discomfort, consult your pediatrician.

Chronic constipation may require additional interventions to ensure your baby’s health and comfort.

Summary

Formula-fed babies may experience constipation due to differences in digestion compared to breastfed babies.

Gentle interventions like switching to digestive-friendly formulas, offering prebiotics and probiotics such as Beginbaby Prebiotic + Probiotic, and incorporating tummy massages can help alleviate digestive discomfort and promote regularity.

 

View Citation

  • Bode, L. (2015). The functional biology of human milk oligosaccharides. Early Human Development, 91(11), 619–622. https://doi.org/10.1016/j.earlhumdev.2015.09.001
  • Elison, E., Vigsnæs, L. K., Rindom Krogsgaard, L., Rasmussen, J., Sørensen, N., McConnell, B., Henningsson, A., & Licht, T. R. (2016). Oral supplementation of Lactobacillus reuteri in infants born by Cesarean section: A randomized double-blind placebo-controlled clinical trial. Applied and Environmental Microbiology, 82(6), 1827–1836. https://doi.org/10.1128/AEM.04052-15
  • Underwood, M. A., Gaerlan, S., & De Leoz, M. L. A. (2019). Human milk oligosaccharides in infant health and disease. Current Opinion in Gastroenterology, 35(2), 1–10. https://doi.org/10.1097/MOG.0000000000000501