My baby is 5 months old. He passes stool once in 3-4 days since a month. Is that normal?

Hey, Unless you feel that baby is getting constipated and having trouble because of passing stool after 3 or 4 days then you can seek doctor's advice. But if she is not constipated then it is all good. Babies poop time and texture keep changing as they grow. She is quite small right now and her poop depends on how much milk she is taking. I do not think you should worry as long as she doesn't show any discomfort because of this.