My son is 3 months old and hes throwing up after every feed. ive tried every brand of similac and enfamil but hes still throwing up.

Lactose intolerance : If he has eczema, allergic family history or blood in the stool, please change formula to a non milk based formula or one that is designed for allergic infants. He also may have lactose intolerance, and a lactose free formula may be useful. Continue to feed and please see your pediatrician.

Likely reflux: Many infants bring up part or all of some feeds due to poor control(closure) of their stomach entrance. Being fed often & laying down most of the time aggravates the issue. It tends to get more forceful as they develop more muscle tone in their belly with age. It can happen with any type of formula. I would consult with your pediatrician for confirmation & management advice.