How much is your baby drinking?!

Jillian
In curious to know how much everyone's babies r drinking and hoe often. I am trying to weed out issues since my baby is very fussy. I was told maybe he isn't drinking enough however he is so spuratic. He is three and a half weeks and drinks 2 to 4 ounces every 3 hours. I feel he should drink more than 2 a Feedibg but no matter how hard I try sometimes he just won't do it. He doesn't poop regularly either which may contribute to not eating but would like to see what everyone else is doing with ounces and hours. Thanks.