I was able to breastfeed him for 5 weeks, but he started eating more and I wasn't able to keep up with him, so we switched him over to formula..he has been doing great on it! He doesn't spit up like at all anymore, seems to be fuller and more content once he's done eating. But me and my husband have noticed that his poops started to get more seedy than normal and it started to look a little thicker. Not hard or anything tho, I was just thinking that maybe his poop is changing now..but just this morning I fed him and layed him back down to go to bed and he looked like he was trying so hard to poop ..and he hasn't pooped since last night around 11pm..and it's now 10am... Idk if he's just not pooping as often anymore or if he'd be constipated..