And he has a BM every 2-3 days. No logic can get past the child's immediate response to his sensation or fear. Children speak the language of their parents, but not the logic. Unfortunately there is no magic formula to get over the hurdle, but most children eventually get there with encouragement, patience, and soft stools. In the meanwhile, since your son is willing to have bowel movements in a diaper, and asks for the diaper to have his BM, encourage him to sit on the potty with his diaper on so he can get used to having a BM in the sitting position while he still has the security of his diaper.
Most infants breathe very rapidly if they have any respiratory problem.
On the other hand, a small infant may experience mild respiratory difficulty from something as minor as a stuffed nose. As time passes between them, she is not as happy and cheerful. It is much harder to get her to smile and coo. She bunches up her fists, pulls her legs up, stomach starts to feel hard. I have been trying mylicon which helps her pass gas sometimes.