20-day-old baby doesn't shit, just fart. What's going on?

Normal 20-day baby stool frequency is not fixed, can be 1-2 days once, can also be 7-8 times a day, mainly related to eating habits. Breastfeeding baby stool frequency, can be 7-8 times a day, or even more than ten times. If artificial feeding baby, stool frequency reduced, sometimes 1-2 days, sometimes even 7 days. Because of the small number of stools, so intestinal gas production, fart more. If the baby continues constipation, abdominal distension accompanied by vomiting, and gradually shows stool secret knot, each time need enema, plug anus suppository or take catharsis agent to alleviate, can see abdominal distension, even in the abdomen can see the shape of intestines, pay attention to exclude congenital megacolon, need to go to surgery.