Are these Muscovy babies OK?

[ben is a terror]

I'm wondering if something is wrong with my 2 4 week? old girls. They will walk around for a few min. then lay down they lay down alot. They eat drink poop and play in the water fine. They are eating waterfowl starter. I'm worried if the have week legs. They walked around the living room tonight walked about 12inches than laid down. They aren't falling down. Are they just lazy?
Thanks

 

[Bleenie]

lol, I just answered this on the 'Muscovy Keepers' thread then saw this one.