Changing Pattern?

Hello,

I just recently got my first dart frogs (3 leucomelas) and am really loving them.
They all have very unique patterns and I was wondering how much their patterns change over time?
If I were to take a picture of them now as 3 month old froglets and compare them to pictures taken 2 years from now would I be able to match them up (for leucomelas as well as other species)?

Thanks,

Justin