I’m trying to introduce formula to my 10 week old. The first night I added an ounce to 3 ounces of breastmilk and he sucked it right down and gave me a 4 hr stretch of sleep. Tried again the last two nights and he is having no part of it. I used the little similac bottles that the doctors gave me that are liquid. Should I try adding the powder formula? Is powder a huge difference?! Any tips on introducing? He doesn’t need formula yet but he will by the end of August. Just trying to fill his belly at this point to get a longer stretch of sleep.