H.G.
My daughter was on the same formula from 2 months until over a year. Even with that she was still constipated but it helped. Im thinking maybe you need to give it more time? His little tummy has had a lot to take on in his short life so maybe it needs adjustment time. That stuff us so gross and smells awful. My pedi said I could put a drop if karo in it to help but it was still gross! My daughter ate it though! The cost is ridiculous (4 yrs ago it was 26$ a can) so I told my pedi anytime they got samples in to please let me know so that helped a little. Give it a little longer and if it doesn't get better I would request a gastro referral. Good luck mama!