My baby poop

That's actually pretty normal for a newborn lah, especially in the first week or two. My son was the same way and it's usually because babies have a strong gastrocolic reflex, meaning their digestive system automatically kicks in when milk enters the stomach. As long as he's feeding well, gaining weight, and the poop looks normal (yellowish, seedy texture), you're likely doing fine. That said, at 5 days old it might be good to check in with your PD or KKH just to make sure he's latching properly and getting enough milk, just to be safe.