How do you get your foal to grow on pony island?

I haven't figured out how to get into the breeder's contest yet, but I found out from a cheat website that you have to get into the breeder's contest and then tap "grow taller." I hope you find out how to get your pony to grow older while in the meantime I'm working at it as well.

i finally got mine to grow up after being in the breeders contest you need to know tricks and know how to groom to enter and have the right things like a comb and soap