i know this might sound weird or strange but ethan keeps hitting me!

i don't know if he actually knows what he's doing but i know for sure it hurts! he's getting bigger and stronger now so his slaps to my face are getting really painful. i've told him "NO" in a stern voice but he just looks at me and keeps smacking away. he doesn't seem to hit anyone else and i don't understand...

has anyone else ever experienced this?