Leckert - Snap! Do we have the same child?

My son started at around 11 months. In hindsight he mainly did it because it got a reaction and he thought it was funny. It was always on my neck. I thought I was getting a cuddle and ow! We didn't react, which is hard as it bloody hurts. It lessened then stopped after a few months.

Then he started again at 18 months and I'm hoping it's now under control. But that's another thread for another time.