I had my doctor (the chap for whom I worked, not my GP) tell DH that BFing was a contraceptive. Luckily he didn't believe him! But this is a man who sees many women who cannot conceive because of high prolactin (milk-making hormone) levels in the blood, and also runs an obstetric clinic for medical problems in pregnancy (such as Gestational Diabetes). And he tells all these women the same!

There's about a year and a week between my mum and her big brother, I'm guessing my grandma was told about this too!