Okay, so, you guys think that the toddlers are random, there's 2 for boys and 2 for girls. I highly disagree that they're random. Here's what I'm guessing.
Boy> Shoot the bug> Ahirukutchi.
Boy> Long jump> Mattaritchi.
Girl> Shoot the bug> Belltchi.
Girl> Long Jump> Hoshitchi.
Correct me if this theory is wrong.