Child actors + adult topics

In the Halloween episode when Russ & Lina are getting their two younger daughters ready to go trick-or-treating Russ mentions the word 'tampon' and the middle daughter, Maya, asks what a tampon is and moments later the youngest asks if they're done talking about tampons. How is more mature topics, subjects, information, and language handled during & after filming when child actors are involved, particularly when they hear things normal kids shouldn't hear and say lines that normal kids shouldn't say? I think Rachel Eggleston is smart & mature enough to understand what tampons are and not to repeat foul language in real life, and maybe many young child actors are too since they can memorize lines, respond to names that aren't their own, and act like a different person, but some of them must repeat in polite company what they've been told to only say on camera.

(this signature was absent on picture day)