hatchling question

I've seen a bunch of pics posted of people's hatchlings inside tubs with wet paper towels. I was wondering what this is for and how long do you leave them in there?

Thanks for the help

many times hatchlings come out with their yolk sack still attached so the damp towels help keep it from drying up and sticking to something, also they will shed withing the first week to 10 days so keeping humidity up helpd facilitate first shed.

Thanks for the help. Very helpful.