All of a sudden spit up 🤦🏻‍♀️🤷🏻‍♀️

My LO is 3.5 months old and is exclusively formula fed (not what I planned but it is what it is). After upping his intake to 6oz every 3ish hrs, finally settling on a brand of bottles (Tommee Tippee) and a brand of formula (Parent’s choice version of Enfamil Gentlease) he has started spitting up more than usual after each feeding. He’s also been pretty stuffy and drooling a good bit and chewing on his hands.

With so many changes so close together I’m at a loss of where to start to figure out the problem 🤷🏻‍♀️.

I decided to go back down to 5oz last night to see if that helps. But I swear he would eat and eat until it came out his ears! 🐷

I’m about to the point of calling his doctor.

Any suggestions/experiences are welcome!