Switching to formula

Marissa

I have a question for every mom that started off breastfeeding and eventually switched to formula. My son is 2 months old, I tried weaning him the past few days and I can't figure out what works !! I did half breast, half bottle and he would throw up. I tried mixing breast milk and formula in a bottle with multiple ratios, he threw up. I gave him formula bottles with no breast milk and he wouldn't throw up, but he is fussy and won't sleep. He burps, he farts aloooottt and he's pooped twice today. Idk what to do, idk if I should give him a little more milk, like is he hungry again? He ate 4oz when he usually eats 5-6. Or does he have a belly ache ?? And what do I do to help him? Can I give him Tylenol or gripe water??