My baby is now 4 months old and when he was born he had SMA formula, however he had trouble getting his wind up and was sick. I had changed him to cow&gate he was still sick but hungrier! I then changed him to cow&gate hungrier baby. He is still sick now and I have been to see a doctor and they gave me gaviscon but it made him constipated. He is sick when I burp him and after feeds up to 2 hours after. Is this reflux?