At three months they´re almost adult size, they grow very fast. Just make sure they have plenty of grass and greens. Have fun! Oh, and the gander doesn´t need to be in with them as long as he can sit really close outside the pen. Ganders just love their babies, but you´ll get through a lot more food with an extra adult to feed. Up to you, of course......Now THAT I can do! Ill just make a sorta "nursery" yard. Good idea with those goats anyway so they dont smash babies! Im certain mama will be on guard for that! Ok I feel better about this. Do they grow at a pretty speedy rate? I have chickens and turkey to compare them to.Yes...chickens are the "gateway" farm animals....lol!