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Pyloric Stenosis


  • Pyloric (pi-LOR-ik) stenosis (ste-NOH-sis) is the narrowing of the pylorus. The pylorus is the area at the lower end of the stomach that connects to the small intestines. The pylorus acts as an outlet for food to pass out of the stomach. Pyloric stenosis occurs when the pylorus muscle of the stomach grows too large and too thick. This prevents food from emptying from the stomach into the small intestine.
  • Caregivers do not exactly know what causes pyloric stenosis. It is thought that problems in the nerves of the pylorus or certain enzymes cause pyloric stenosis. Symptoms include frequent and often forceful vomiting (throwing up) of newly fed milk. This may lead to dehydration (losing to much body fluids). Tests include ultrasound and x-rays of the abdomen (belly). Surgery corrects pyloric stenosis and helps your baby to go back living a normal life.



  • Keep a current list of your child's medicines: Include the amounts, and when, how, and why they are taken. Bring the list and the medicines in their containers to follow-up visits. Carry your child's medicine list with you in case of an emergency. Throw away old medicine lists. Give vitamins, herbs, or food supplements only as directed.
  • Give your child's medicine as directed: Call your child's primary healthcare provider if you think the medicine is not working as expected. Tell him if your child is allergic to any medicine. Ask before you change or stop giving your child his medicines.
  • Do not give aspirin to children under 18 years of age: Your child could develop Reye syndrome if he takes aspirin. Reye syndrome can cause life-threatening brain and liver damage. Check your child's medicine labels for aspirin, salicylates, or oil of wintergreen.
  • Ibuprofen or acetaminophen: These medicines are given to decrease your child's pain and fever. They can be bought without a doctor's order. Ask how much medicine is safe to give your child, and how often to give it.

Ask for more information about where and when to take your child for follow-up visits:

For continuing care, treatments, or home services for your child, ask for information.

Home care:

  • Follow your caregivers instructions on how much and how often to feed your baby.
  • Your baby may vomit after feedings even after the pyloric stenosis has been fixed. This may be caused by swelling around the surgery area. Babies may also vomit a few times for the first 2 to 3 days after surgery.
  • Keep his belly clean and dry. Ask your caregivers for instructions on how to clean your baby's incision (cut) and when he can have a tub bath.
  • Do not remove the steri-strips until caregivers tell you to do so. Steri-strips are small, thin pieces of tape over the incision. Steri-strips may peel off by themselves after a few days.


  • Your child has a fever.
  • Your baby's vomit has coffee-ground material or blood in it.
  • You have any questions about your baby's pyloric stenosis and its treatments.


  • Your baby's incision (cut) bleeds or has a foul smelling discharge.
  • Your baby is vomiting and cannot keep any liquids down.
  • Your baby has any of the following signs of dehydration:
    • Dry mouth or cracked lips.
    • Fast heartbeat or breathing.
    • More irritable or fussy than normal.
    • Passing little to no urine.
    • Sunken eyes or fontanels (soft spot on the top of the head).

Learn more about Pyloric Stenosis (Aftercare Instructions)

Associated drugs

IBM Watson Micromedex

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.