Trial and error. We had her on Gerber Sensitive, it made her sick. Then we tried a Similac preemie that we thought might be better. It wasn't. So then we tried Similac Sensitive for Fussiness and Gas, and it's been working great. It's a soy type of formula. Your baby might just have a delicate tummy with the full milk formulas. Soy is supposed to help alot. Smells nasty, though, lol.

Yea it sounds like a stomach ache.

He throwing up or spiting a lot?

@taija, how do you know if it's working right?

My daughter kept throwing up all of her food quite a bit. Turns out it was the formula we had her on. We tried 4 different types before we found one that actually works.

it's happened once before but I didn't see it happen...the daycare he goes to told me he had done it...after how many times should I be worried

yup , if it's a one time thing don't worry. if it keeps happening call doc