creche references highly needed

Very difficult to get a proper objective reference for a creche.
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You can get an inspection report from ONE or Kind & Gezin (the 2 bodies that regulate creches). They will highlight any major concerns. You should stear clear of any that are not regulated.
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Other than that, make sure that they fit in with your working hours (allow for traffic), and the human care side of things is far more important than the physical shape of the buildings.
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Talk to the staff and see how long they've been there. Lots of turnover points to major issues.