The youngest ALWAYS seems to be into more things than the older ones. I'm sure your DD is fine.

It turned out that my DS (who had a permanent bruise on his head!) has joint hyper extension which means he has weaker muscles so when he fell (which happened more often because of the hyper extension) his arms couldn't support his body weight and especially the weight of his head so his head would hit the ground. Just putting it out there.

If one more person said to me, oh look, another bump on his head, I'd have cried. Like we don't love and try to protect our children. They are just active and push boundaries - it's how they learn.