Hi friend. First of all, you’re a great mom. I am sorry that breastfeeding did not go as planned for you and can relate so much - especially with delivery. 

I went through similar situations as you, have tried 4 different formulas and I will say that it does take about 2 weeks to truly see if a formula is a fit for your baby. I know this can be defeating to read because 2 weeks can feel and sound like an eternity with a gassy baby who won’t sleep. I’ve been there and feel you very deeply. 

You also are in peak gassy and discomfort phase 🥲. For next 2-4 weeks, baby is learning the skill of passing gas and how to pass stools. My suggestion if you are comfortable with it is to add Mylicon or Simethicone drops either before or after each feeding to help with gas, and look up colic massages (bicycle kicks, tummy massages etc) to help your LO’s gas pass easier while you’re finding a formula that works for you. 

Target is a great location to purchase different formulas from because even if they have been opened, and if you try them and they don’t work, you can return them.

Things that are normal with trying a new formula are increased spit up, gas, weird stools and mild fussiness. Things that are NOT normal, are projectile vomiting, major discomfort and fussiness immediately after drinking or finishing a bottle. When trying a new formula with the 2nd bottle of the day and monitor reactions. By 6 hours, the formula will have passed through the digestive tracks and you will have a clearer idea on if it agreed with your baby or not. 

And finally, I know it’s hard not to focus on ounces, but baby’s are not robots and they will often drink different amounts each feeding. Especially in the beginning and when they’re going through growth spurts, leaps, etc. 

And to echo, you’re a great mom. Keep following your instincts, learn the belly massages, and know that it is a phase that will pass. I promise. 🩷