My S is single, and he has never wanted kids. He recently had a conversation with his boss, who has two kids. S was blown away by the amount of money his boss pays for childcare. He had never thought about it before. I definitely think childcare costs should be included in any financial literacy course.
And I know for a fact that many students overestimate their earnings, because I have worked with students doing federal loan exit counseling. When they would tell me their expected salary, I had to keep from saying, “Good luck with that.”