New ducklings eating but not pooping? Please help

[DuckyMomOf6]

Yesterday I hatched two rouen ducklings in my incubator. They seem extremely healthy and are running around, eating, and drinking water. The problem is, they've only pooped once. And they've had a very healthy appetite so they should have pooped by now? I have them on duckling crumbles 20%, supplemented it with niacin, fresh water that I change several times daily, clean bedding, and they are nice and warm. I checked for pasty vent, but see no signs of it at all. Should I be concerned? They seem extremely healthy in every other way, except one of their tails is maybe down a little, which has me worried also

 

[Yardmom]

Being active so early is a good sign that they are healthy. Give them some time. They will produce plenty of poop.

 

[KathiQuacks]

I agree on giving them some time. My hatchlings pooped very infrequently. Only a few poops for the 1st day or so.
Soon they will be poopy machines, and you will wish that they’d stop