This might be a really dumb question but I’ve been wondering how women in the 20’s managed to only have one child?
Wasn’t reliable contraception basically impossible to get at that time?
For example: Zelda Fitzgerald, and Agatha Christie only had one each and I’m just wondering how they prevented subsequent pregnancies because it seems like it would be hard.
There's always more that can be said, but you may be interested in my previous answer to What was married sex life like before birth control? The story does change in the early twentieth century as contraception was becoming somewhat more available/effective, but this does get at the essential underlying issue.
More can always be said, but this older thread with input from /u/kosmic_osmo, and also myself, might be of interest.