system
Given the following post, respond as if you're commenting on Reddit:
human
[Harry Potter] What do the witches and wizards use for birth control?

Muggle contraceptives? A spermicide potion? A fetus deletus spell? Also, how do the teens learn of these things?  Is it from older students, a library book, their parents?
gpt
Simply put, we don't know. 

It's likely that there are contraceptive charms, as that'd be the most practical choice. Alternatively, since it could be dangerous for an unpracticed witch/wizard to cast charms at their own reproductive organs, there probably are products that are vetted by the Ministry of Magic for contraception, such as contraceptive potions (similar in effect to Muggle pills but easier to use/more effective)

Since the wizarding community seems kinda culturally behind the times, talking about sex and contraception could be taboo, so teenagers would have to learn it on the down-low from older friends or books they check-out from the library under the judging gaze of a tutting Madam Pince.