You could ask the breeder which one is the least energetic  (in the litter) or which one is the quietist ( in the litter)

females are silver and males are kind of yellow and orange

Hi, I have an adult garden skink and I feed it moths and lettuce (its name is Nelson). 

For my  baby skink I feed it ants not moths because it is hard for them to digest (its name is Casper). I hope you learnt some new things. :)