AmericanMom your poults are very adorable they look like my BR's. What kind are they?
I have not had a problem with the legs as of yet. Knock on wood.... I used some of that rubber shelf liner from the dollar general store in the bottom of my bators while hatching and also in the bottom of the brooder for a few days till I switched to sand.
My chicks still get pine shavings but I also use the shelf liner for a few days till they are up walking good and have their balance. Keep in mind I am still only on my 3rd year of poultry so I am still new and learning also.