Atresia of Small Intestine: Causes, Symptoms, and Treatment
Medically reviewed by Harsha Moole, MD, Internal Medicine. Last reviewed: October 2, 2026.
What kind of doctor treats Atresia of Small Intestine?
A pediatric surgeon performs the repair. A gastroenterologist often helps with follow-up care, and neonatologists manage the baby's overall health in the hospital. A direct primary care or concierge doctor can be a first stop for an evaluation and can refer you to a specialist when needed.
What it is
Atresia of the small intestine is a birth defect in which part of the small bowel, the tube that digests food and absorbs nutrients, is missing or closed off. Doctors usually find it before or shortly after birth, and surgery is needed to repair it.
Symptoms
Most babies show signs within the first day or two of life: greenish vomiting that contains bile, a swollen belly, little or no stool, and trouble feeding. An ultrasound before birth sometimes shows extra fluid in the belly or too much amniotic fluid.
Causes and who gets it
Doctors believe it happens when blood flow to part of the developing intestine is cut off before birth. It is not usually caused by anything the parents did and occurs in roughly one of every few thousand births.
How doctors diagnose it
Many cases are found before birth on a routine ultrasound. After birth, doctors take an X-ray of the belly, sometimes with a contrast dye study, to confirm the blockage and plan treatment.
Treatment
Treatment is surgery to remove the closed-off section of bowel and join the healthy ends together. Surgeons may place a temporary opening called an ostomy, which lets stool leave the body into a bag. Before surgery, babies receive fluids through a vein and a nose tube keeps the stomach empty.
When to see a doctor
For a newborn, green vomiting, a swollen belly, or no stool in the first day or two needs medical care right away, since these signs can point to a bowel blockage, an emergency. If an ultrasound shows a possible bowel problem during pregnancy, the care team will plan delivery at a hospital with newborn surgery services.
How a direct primary care or concierge doctor fits in
A direct primary care doctor charges a flat monthly fee instead of billing insurance; a concierge doctor usually charges more and often works alongside insurance. Either one can handle routine checkups, growth monitoring, and feeding questions for a child who had intestinal atresia repaired, but would refer the family to a specialist for surgery or complex hospital care.
Common questions
Can a baby live a normal life after surgery?
Many children do very well after the repair and grow up healthy. Some have ongoing issues such as trouble absorbing nutrients. Others develop scar tissue that causes blockages later. Each child's outcome depends on how much bowel was affected, so results differ from person to person.
Is this condition caused by something the mother did during pregnancy?
In most cases, no. Doctors believe it usually happens because of a random loss of blood flow to the developing bowel. It is not linked to anything a parent did or did not do.
Can it be found before birth?
Yes, ultrasound scans during pregnancy sometimes show signs such as extra fluid in the baby's belly. Finding it early lets the care team plan for treatment right after delivery. Not every case is seen on ultrasound, though.
Will my child need more than one surgery?
Some children need only one operation, while others need more. This is especially true if a long section of bowel was affected or if a temporary ostomy was placed. The surgical team will explain the plan for each child. Recovery and needs vary from child to child.
Sources
Medical Disclaimer
This content is for general educational and informational purposes only and is not medical advice. It is not a substitute for professional medical advice, diagnosis, or treatment, and reading it does not create a doctor-patient relationship. Always seek the advice of your physician or another qualified health provider with any questions about a medical condition, and never disregard or delay seeking professional advice because of something you read here. If you think you may have a medical emergency, call 911 (or your local emergency number) immediately.
