Studies found higher rates of this disorder among certain families. Pyloric stenosis is more common in babies born prematurely than in full-term babies. Pyloric stenosis is more common in white and Hispanic children. Pyloric stenosis is seen more often in boys, especially firstborn children, than in girls. Risk factors for pyloric stenosis include: Isn't gaining weight or is losing weight.Urinates much less frequently or has noticeably fewer bowel movements.Seems less active or unusually irritable. Pyloric stenosis can keep a baby from gaining weight, and sometimes can cause weight loss. Since pyloric stenosis prevents food from reaching the intestines, babies with this condition might be constipated. You might find yourself changing fewer wet diapers or diapers that aren't as wet as you expect. Your baby might cry without tears or become lethargic. The contractions are caused by stomach muscles trying to force food through the narrowed pylorus. These contractions are part of the digestive process known as peristalsis. You may notice wavelike contractions that ripple across your baby's upper stomach area soon after feeding but before vomiting. Babies who have pyloric stenosis often want to eat soon after vomiting. But over time, it becomes more severe as the pylorus opening narrows. The baby may vomit forcefully, ejecting breast milk or formula up to several feet away. Pyloric stenosis is rare in babies older than 3 months. Symptoms of pyloric stenosis usually appear within 3 to 5 weeks after birth. Regional Neonatal Intensive Care Unit (RNICU).Hospitalists & Internal Medicine Physicians.
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