I asked my doctor and he said there's nothing u can really do cuz of the age. We were using similac pro-advance and switched to similac total comfort and it helped
Could be the formula. His digestive system is new and he is not used to it. May need to try a different formula -- however, some doctors don't get alarmed about constipation in babies until it's been a few days (3 or more....usually a week in some cases). Just help with the movements naturally: bicycle his legs slowly, rub tummy gently. Discuss with doctor tomorrow about a different formula is needed. Could also be colic causing the screaming.