My baby boy is 5 weeks and 3 days , he has gas problem from the start. I have been pumping and using gripe water. now i am switching to similac sensetive formula since he is still in pain and fussy at times. I am not sure if this will help him as I started on formula. I am lost on what to do for his pain. I use dr brown bottles too... any formulas you recommend? Could baby have allergies to milk ? Is organic better?