Supporting Your Baby's Gut: What Every New Parent Should Know

By: Dr. Cindy Tung, MD, FAAP
Board-Certified Pediatrician


If you've ever spent time with a newborn, you know their digestive system likes to keep you guessing.

One day everything seems perfectly normal. The next, they're extra gassy, fussier than usual, or adjusting to a brand-new feeding routine.

It's enough to make any parent wonder if something is wrong.

The good news is that a baby's digestive system is still learning. During the first few months of life, their gut is developing rapidly, adapting to new foods, and building the community of bacteria known as the gut microbiome.

Most of the time, that's exactly what it's supposed to do.

What Is the Gut Microbiome?

The gut microbiome is made up of trillions of microorganisms that naturally live in the digestive tract.

While that may sound intimidating, these bacteria play an important role in everyday health. They help digest food, interact with the immune system, and contribute to a healthy digestive environment.

A baby's microbiome begins developing at birth and continues to change throughout infancy and early childhood.

It's one of the many reasons the first few years of life are such an important time for growth and development.

What Affects a Baby's Gut?

Every baby is different, and so is every gut.

A number of factors can influence how a baby's microbiome develops, including:

• Whether they're breastfed, formula-fed, or both.

• Introducing solid foods.

• Illnesses during infancy.

• Antibiotic use.

• Everyday growth and development.

None of these factors are inherently good or bad. They're simply part of the journey every baby's digestive system takes as it matures.

Is Gas Normal?

Almost always.

Babies swallow air while feeding, have immature digestive systems, and are learning how to coordinate the muscles involved in passing gas.

That can lead to plenty of grunting, squirming, and fussiness.

While it can certainly be stressful for parents, occasional gas is usually a normal part of infancy.

If your baby seems inconsolable, isn't feeding well, has blood in their stool, persistent vomiting, or isn't gaining weight as expected, it's important to contact your pediatrician.

What About Probiotics?

Probiotics have become increasingly popular for infants, and parents often ask whether they're necessary.

The answer depends on the individual baby.

Some probiotic strains have been studied in infants, but probiotics are not a routine recommendation for every newborn.

If you're considering a probiotic, it's worth having a conversation with your pediatrician about whether it's appropriate for your baby's specific needs and which strains have actually been studied.

Small Routines Matter

One thing I remind parents often is that babies don't need perfect routines.

They need consistent ones.

Feeding your baby, helping them burp, giving them time to move and stretch, and following up with regular pediatric visits all play a role in supporting healthy growth.

The little things really do add up.

The Bottom Line

A baby's digestive system is constantly growing and changing during the first year of life.

Gas, occasional fussiness, and changes in bowel habits are often a normal part of that process.

If you ever have concerns about your baby's feeding, growth, or digestion, don't hesitate to bring them up with your pediatrician. No question is too small when it comes to your child's health.

Every baby develops at their own pace, and sometimes a little reassurance is exactly what parents need.