Time to deliver a baby [duplicate]
Solution 1:
Bethesda support officially states "after a few hours"
https://help.bethesda.net/app/answers/detail/a_id/29971/~/why-won%E2%80%99t-my-pregnant-dwellers-give-birth-in-fallout-shelter%3F
Other sources state "3 hours".
https://www.androidauthority.com/fallout-shelter-tips-tricks-guide-970517/