> child birth care in the Netherlands specifically informs all new parents that breastfeeding is not a good contraceptive
But that's a lie. Breastfeeding is an excellent contraceptive, more effective than almost any other method we know. (Hormonal implants, which can't be misused, will be more effective. But only slightly more effective, because breastfeeding is already so effective that there's very little room for improvement.)
Not only the Dutch health services disagree, also the British NHS has this in their public info:
> You can get pregnant as little as 3 weeks after the birth of a baby, even if you're breastfeeding and your periods haven't started again.
> Unless you want to get pregnant again, it's important to use some kind of contraception every time you have sex after giving birth, including the first time.
But that's a lie. Breastfeeding is an excellent contraceptive, more effective than almost any other method we know. (Hormonal implants, which can't be misused, will be more effective. But only slightly more effective, because breastfeeding is already so effective that there's very little room for improvement.)