21 month old, biting hard all the children at childminders and brother, - what can I do?

[StarOfValkyrie]

She bites another child at least once a day. Hard, teeth marks and a bruise that lasts up to a week. She does it a lot and I'm worried I'll lose my childminder.

When she did it to her brother 2 nights ago I put her straight in bed. When she did it again yesterda, I smacked her (never smacked her brother and he's got very challenging behaviour). She screamed but again, today, she bit him. She does it in temper when she doesn't get her own way.

What can I do?

Watch her carefully, try to identify things that trigger biting behaviour and avoid them.

When she does bite, say no, remove her from the situation and make a big fuss of the victim.

Close supervision and intervening before she bites is more effective than smacking her afterwards.

Hmmmm. I don't know why she does it at the childminders. I know it is usually over a toy that she won't share. At home it is tricky because her brother is severely autistic and he can't share either.

At some point I HAVE to cook dinner or answer the phone, or go to the loo, and that is when it usually happens. A bit tricky to do closer supervision than I already do. Neither will watch TV so I don't even have an electronic babysitter.