A little tmi

My 7 month old sons poop is basically bright yellow water. Like diarrhea. And he's pooping like every 2 hours. He's also puked a couple times the last few days. I've just started giving him Motrin and pedialite and continuing his formula. Idk what else to do or how to make him feel better. Any advice will be helpful. He's not running a fever or anything.