
What Does a Swollen Abdomen Mean in a Newborn?

Your newborn’s tiny body goes through many changes in the first few weeks of life, but some signs and symptoms may raise concerns. One such sign is a swollen or distended abdomen.
Though this condition isn’t always a cause for alarm, our team at Northeast Pediatric Associates PA can determine the severity of your baby’s health issue and identify any underlying issues that might require medical attention.
Common causes of abdominal swelling in newborns
1. Normal digestive changes
Newborns have immature digestive systems, and their bellies may appear slightly bloated after feeding. This is usually temporary and resolves on its own as your baby processes milk or formula.
2. Gas and constipation
A common reason for a swollen abdomen in newborns is trapped gas or constipation. Babies swallow air while feeding, which can lead to bloating.
If your baby is passing gas and having regular bowel movements, mild abdominal distention is usually harmless. However, if your baby seems uncomfortable, a gentle tummy massage or bicycling their legs may help relieve gas.
3. Meconium plug or delayed bowel movements
Newborns typically pass their first stool, called meconium, within the first 24-48 hours after birth. If your baby hasn’t had a bowel movement in this timeframe, it could indicate a blockage or another condition like meconium plug syndrome, which may require medical evaluation.
4. Milk intolerance or allergies
Some babies have difficulty digesting certain components of breast milk or formula, leading to bloating and discomfort. Lactose intolerance is rare in newborns, but a cow’s milk protein allergy can cause digestive distress, including swelling and colic-like symptoms.
5. Hirschsprung’s disease
This congenital condition occurs when certain nerve cells are missing in a baby’s intestines, preventing normal bowel movements. It can cause severe constipation, bloating, and feeding difficulties. Babies with Hirschsprung’s disease often require medical intervention.
6. Intestinal blockage or malrotation
A swollen abdomen in a newborn, especially if accompanied by vomiting, feeding difficulties, or a lack of bowel movements, may signal an intestinal obstruction. Conditions such as volvulus (twisting of the intestines) or meconium ileus (a blockage caused by thick meconium) require urgent medical attention.
When to seek medical help
Contact our pediatric team if your baby’s swollen belly is accompanied by:
- Persistent vomiting, especially green (bilious) vomit
- No bowel movements for more than 48 hours
- Severe irritability or pain
- Poor feeding or lethargy
- A tight, shiny, or hard abdomen
A swollen abdomen in a newborn isn’t always a cause for concern, but it’s important to monitor your baby’s symptoms. If you notice signs of discomfort, feeding issues, or prolonged swelling, we can provide guidance. Early evaluation can help address any underlying issues and ensure your baby’s health and well-being.
Learn more by contacting our team to schedule an appointment at the location nearest you — in Northeast San Antonio, Northcentral San Antonio, Schertz, Bulverde, or Castroville, Texas.
You Might Also Enjoy...


What Vaccines Will My Baby Need?

6 Practical Ways to Prepare for Your First Childbirth

Pediatric Care Starts Earlier Than You Think: Expectant Mother Visits

What Can I Expect During My Baby’s First Developmental Screening?
