Our expert says:
It is very possible that there is a bully at the creche, or that more broadly he may see other kids hitting each other. Talk with the folks at the creche to find out more about what may be happening there ( and they must have a lot of experience of how children that age behave there, and why ). 19 months is young to be going to a creche, and we have less experience of how children that young respond to these circumstances. If he's only been going for about a month, maybe he still feels angry with you for "going away" and leaving him there.
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