I can't find my rulebook anywhere (go figure), so maybe someone can help me. My son just turned a year old and he'll be almost 14 months by the time our first show comes along. He sits on the saddle well and holds on great. I've had him on the back of minis forever! Anyways, my question is I can't get the stirrups high enough for his feet since he's so small. Is it mandatory for him to have his feet in stirrups??? Here's a pic of him not too long ago..