The amount of the personal contribution of maternity care in 2015 is 4,15 per hour. (NZA tariff)
Kraamzorg Mama en Baby has an agreement with a lot of health care providers. Depending on your insurance policy the maternity care will be compensated (fully/partially) by your health care provider. The best thing to do is to check your insurance policy and contact your health care provider and ask about it.