Formula for Newborn

Hello ladies! My little guy is 6 weeks tomorrow. Wondering if anyone else is having trouble with formula? He is currently on similac pro sensitive. He eats it but then about 10 minutes after he is usually screaming and having gas pains. This goes on a lot during the day. Most of the day...

Wondering any suggestions for what worked. He also isn’t pooping regular. I’ve used mylicon, gripe water and now Gerber Soothe drops which have been making him go more.