Toddler keeps throwing his head back & busting my nose

Je

Any advice on how to handle this? He gets excited & does it without realizing he hurts me. He turns 2 this month & he’s been doing it for 6 months or so. I’ve followed the drs advice of telling him to be gentle, tried being firm with him & saying we don’t do that. I’m out of ideas & I have baby number #2 on the way. I have to figure out how to treat him to be more gentle so he doesn’t hurt his baby sibling.