In the beginning my son was getting gas pains from the regular similac formula. He would cry all the time until he had relief. So we switched him to the similac sensitive. It was great. He didn't suffer from the gas pains like he used to. The formula was very gentle on his stomach and he was very regular. Some of the other formulas and store brand formulas that were the same or similar didn't work as well for him. The store brand especially would make him constipated. It would hurt his belly even worse then it was with just gas pains. With my next child, I am planning on using this formula if the...