Difficulty in pooing

Poor baby Caden been having difficulty in pooing recently. In his first month, he tends to poo almost everyday. Sometimes even twice a day. However, things changes when he is going into his second month. This morning, he had so much difficulty in pooing that I feel like giving up asking him to poo. My mum been trying to make him poo using a "tum tom". He looks so miserable trying to force the poo out. Deardear and I have brought him to Dr Ong for a check. However, Dr Ong says its ok as long as the poo is soft and there is no blood on it. But somehow, baby Caden just do not like to poo. Poor thing...