Feedings - 3 months 1 week

Ash
Hello My Fellow Momma's!
I had a beautiful baby boy on 12/11. He has been switched to formula only on month two (for many reasons and I did not want to give it up). 
Anyways.....my kid is a tank. He drinks 5-6oz every 2 hours. He's not even chunky he's just starting to getting those adorable baby roles on his thighs and his cute double chin! We had a rough start at feeding so that's probably why. 
For those of you who bottle feed formula or BM how often does your baby eat? If they go longer than 2 hours how do you stretch it? I'm wondering if it's the brand of formula I use. It's the kirkland infant formula brand from Costco only sweetened by lactose. 
He also sucks a napping and I can't seem to get him down without a fight. They say cry it out shouldn't be used until 4 months. He used
to be so good until he hit the 3 month mark! 
Any advice is appreciated! Or similar stories 😁