1 Month Old Stomach Aches, Trapped Gas, Trouble with Bowel Movements

My son is a month old today. He's been having trouble for weeks with trapped gas, stomach aches, and at first when this started it was hard for him to have a bowel movement and now it has been 3 days since he has.

We have tried switching his formula to Similac Total Comfort. It's suppose to be easier to digest and helps with gas. We started him on baby food, rice cereal and prunes. Hopeing it would help but he is still having trouble.

I'm not sure what else to try but I am open to almost anything that will help him feel better.