Yeah I am totally against the idea of childcare dealing with it in that way, totally off.
I am surprised they cannot make suggestions as well, they should have a behaviour management policy in place and should be able to observe when and 'why' it is happening and create an individual management plan to assist your child in not continuing with these behaviours.
Unless it is occurring at home the behaviour can not *really* be managed by you... I am at a loss really because although we would discuss it with you, and develop strategies in consultation with you - it is us that would be doing a lot of the behaviour management because it is happening at the centre.
Suggestions for managing detrimental behaviours such as biting, scratching etc are generally by creating tactile experiences (such as play dough, finger paint, sand play, water play) for the child to engage in so that they are 'busy'. And the child carers should be encouraging positive interactions and guiding children away from negative interations etc.
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