Using head as a battering ram!

[MyBreadIsEggy]

When does this stop?!!
My 17 month old uses her head and face as a battering ram against everything. She either doesn't register that it hurts, or she doesn't learn from it when it does hurt!
I don't mean she walks up to walls and smashed her head into them (although she will repeatedly bash her head/face against soft things like beds and the sofas ) I mean her head appears to be her leading centre and comes into contact with everything before the rest of her body.
When she climbs up into the sofa, she doesn't climb up using her arms and legs while keeping her upper-body upright, she face plants into the sofa and then climbs up...which is all well and good on a soft furnishing. But then she does it when she's climbing on a persons lap (another problem in itself!), resulting in her head butting kneecaps/hip bones etc and crying because it hurt. She's just climbed onto my lap, while my hands were in my lap, and before I had chance to move my hands away, she had planted her face down and dragged it along my lap, resulting in a big scratch from the stone in my engagement ring down the side of her face!!
Surely she will realise soon that she cannot continue to use her head as her leading centre without hurting herself?!

[eatsleephockeyrepeat]

DS is 15.5mo and is exactly the same; worst of all the thing he "batters" the most is my poor face! I'm not sure he'll have any brain cells left by the time he goes to school

Sorry I'm not more help, I can only assume they can't go on like this forever.