Give it time it can take up to a week for milk to come in. his stomach is so tiny even the tiniest bit of colostrum is all he needs right now. Keep doing what you're doing and just latch every chance you get. You're doing great!

@maesmommy04, If he can latch perfectly on to your nipple. It is not an issue.

I was told his latch is perfect but because my nipples aren't stimulating his suck reflux or even staying hard the nurse thought I might have flat nipples. Not sure.

Is baby latching properly? If there is no latching issues than there is no issue with your nipple. Your milk comes in by day 3! Keep latching him and don’t give up!