I hatched 2 Rouen ducklings yesterday. I took them out of the bator this morning and put them in the brooder. They seem very weak. They're not walking around ..they're just laying there....when I pick them up they chirp alot but when I set them back down they just lay there. Is this normal for baby ducks? My silkies (now 5 weeks old) were up and running around by this time. Any advice??