I would prefer someone who has worked with young kids before. She could be a mom herself or single but has handles children. You can ask around if your friends know of someone or go to an agency. I would suggest training the helper for a couple of weeks before letting her look after your child alone. Also, you should stress out her responsibilities. Should she concentrate on the kids? Or the housework? We treat our helper like a family member and so she treats our kid like her own too :-)
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