Waves-is the Enfamil less expensive than the GoodStart? They are the same here. We have been using Similac Sensative at night and she's def not pooping great so I'm thinking of starting the GoodStart. I think it's just a matter of finding what's works best for what baby. The doc told me anything with a gold lid will be most constipating, I think if she's spotting up and fussy with only a little introduction like that it's probably not gonna work for her. I hope the other one works! I called Gerber and they were more than happy to send samples-try that!