I agree. Like everything, there needs to be clear explanations with an explicit understanding that breastfeeding is effective as contraception if and only if the prerequisite conditions are met.
Women are going to read that breastfeeding (when done according to the strict criteria) works as a contraceptive for the first 6 months on the NHS website, WHO website, Planned Parenthood website (US) and Family Planning Association (UK), to name but a few. Countless scientific studies can also be found on Google easily supporting this.
Then if a woman reads this and believes that breastfeeding is a form of contraception, she is often absolutely lambasted and the conversation is shut down, and it is heavily implied that the woman is ignorant and probably thinks you can get pregnant from sharing a swimming pool with a man. The scorn and ridicule annoy me.
Instead of, 'yes there are many studies which show that breastfeeding can be used as contraception, but the actual myth is that it can be any kind of breastfeeding at any stage of the child's life'. My baby is 9 months and still breastfeeding a lot, but she eats solid food and goes longer stretches. I know I could get pregnant now. 6 months ago, she bf around the clock, regular night waking, rarely separated, no period, no dummy, no formula, just constant breastmilk. I would not have expected to get pregnant then. That's the difference.
It shouldn't be a blanket scoffing attitude. It just makes the scoffers look like they are the ones who need to do a bit more research.