The au pair insurance guidelines have changed starting from June 1st 2013: 

 http://www.johoinsurances.nl/images/pdf/isis/au_pair/isis_aupair__folder.pdf

 instruction_apply_basic_health_insurance_for_au_pair-pdf 

    http://www.insurancesinthenetherlands.nl/health-insurance/temporary-stay-in-the-netherlands/au-pair-in-the-netherlands