ds is 13 weeks and after several weeks of gaining 5-6oz a week, he has only gained 2oz in the last 3 weeks. He hasn't had a poo for 6 days. He saw the peadiatrician yesterday and she said he didn't feel like he had a full stomach. I got the impression that she didn't believe that he hadn't had a poo. He has 5 feeds a day and doesn't appear to want any more, he is not all that interested in the feeds he gets.
How concerned should I be. Is there any way I can get him to gain more weight?