My son is 8 months old. He flails his arms and he slaps everything. He slaps you on the chest or face whenever you pick him up. He's just excited, he's a super happy baby, but sometimes it can hurt because he flails pretty hard. I have to watch him like a hawk when he's around the cats or other babies, and I have to warn people when they pick him up.
Is there something I can do to get him to understand that he's supposed to be gentle?