Why do only male children get pyloric stenosis?

Not true: Male infants have a 5/1 frequency compared to females but it does occur in both. The reason is unclear.

Not quite accurate: Hypertrophic pyloric stenosis (hps) occurs in girl babies, too, but it is 5 times more common in boys than girls. It is also 5 times more common in whites than blacks. So, the most common baby with hps is a white boy baby. No one really knows why. It probably has some genetic basis.

More males not all: Causes are unknown, but some genetic and environmental factors probably. Higher rates among certain families and offspring of mothers who had pyloric stenosis.Pyloric stenosis occurs more often in males than in females.Early antibiotic use in infants and during pregnancy of mothers may play role.3 out of 1,000 babies in US.4 x more in 1st born males.If in parent then infant 20% chance