Not enough wet diapers

Kaitlyn
So my little guy is on his third day of life and I'm worried he's not having enough wet diapers. He just had his 4th poopy diaper, but has only had 1 wet one. He was able to meet the expectations the first two days when he wasn't nursing well at all. I got a nipple shield yesterday before we went home and he is nursing every 2-3 hours for 20-30 minutes now and I know he is getting some out because the shield has a lot in it when we are done and I can hear him swallowing. He was circumcised on Thursday, so I don't know if that ever effects wet diapers. Anyone have any advice or experience with this? Thanks so much for your help!