They may have trouble gaining weight as they grow, or even lose weight. Babies with pyloric stenosis do not get enough fluids and nutrients from feedings and may become dangerously dehydrated. Because pyloric stenosis prevents what babies eat from reaching the intestines, they may become constipated. After feedings, you may notice waves of contractions ripple across the top of your baby's abdomen, from left to right, as the stomach tries to push food through the pylorus.Ĭonstipation.

Babies with pyloric stenosis may be hungry still (or again) after vomiting. Because breastmilk or formula is blocked from passing through the stomach, the baby throws up-sometimes forcefully enough to launch their stomach contents several feet away! The vomiting may gradually get worse as the pylorus muscle thickens. Vomiting after every feeding or only after some feedings. Signs your baby may have hypertrophic pyloric stenosis: Infants with pyloric stenosis have a hard time keeping anything down after feedings―usually starting between 2 and 8 weeks of age. This leads to excessive, projectile vomiting. When it becomes too think ( hypertrophied), breastmilk or formula can't get through to the small intestines. Pyloric stenosis is a narrowing of the pylorus―a muscular valve at the bottom of the stomach. In some babies, frequent projectile vomiting can be a symptom of a condition called hypertrophic pyloric stenosis (HPS) it occurs in 1 out of every 500 or so babies. While occasional dribbles of spit-up after meals is common in infants and usually harmless, true vomiting is more concerning. After a baby's feeding, many new parents quickly learn, some of what goes down often comes back up.

Projectile vomiting