Traylee01 - I used Heinz Nurture with my last son, from 3 months, and it was great. Easy to mix, cheaper than most formulas and I had absolutely no problems with constipation. I used S26 with my first son, and he had such bad constipation he was in hospital. I don't recommend anyone use S26, but it works for some people. Heinz Nurture is the one I would use again if I were to go to formula.