Quoting Kristin B. +down.40+:" no I haven't. I didn't want to until I talked to his pedi about it."You're probably going to have to switch to a Sensitive or gentle formula. Some babies are just really gassy though and there's not much you can do. When he gets really fussy and gassy, lay him on his back and bicycle kick his legs. It will help things move around and make it easier to pass.