For a while now DD has been in the habit of pulling her own hair whilst nursing to sleep/tired and nursing. She does it repeatedly, but mostly not to hard.
Yesterday she was pulling really hard, in fact, pulling quite a bit (not very much to start with) of her hair out. I found it quite upsetting. 
Has anyone else's toddler done this? I'm reluctant to mention to HV in case she comes out with some old shite, but is it common|? Something I need to worry about?