I'm kind of worried of the size of Lalafell children though..they'll never see anything above knee height of other characters x)

And I really don't think anything is wrong with playing as a child. Roleplaying (which a RPG is about, after all) is about playing a role you aren't yourself.
Guess what, I'm not a Miqo'te in real life. So why would it be gross or creepy to play as a child just because I'm older in RL?