As the title says when I try to feed him with a size 1 teat he loses his s*t and gets so angry. When his dad uses size one he manages to get a good amount in him. Sometimes when I use size 1 no issues. Feel like size 1 is too big still and causing him to take in more air leaving him with trapped wind. Wish there was a size in-between 0 and 1. Or maybe I'm doing something wrong? For context baby was born quite small and he's only just 4kg at 5 weeks. I don't think he's ready for size 1 but dad gets bored with flow of 0. I find using a 1 takes longer as he gets upset