My vault is at the population limit of 200. I am constantly getting objectives to deliver (insert number) baby dwellers and have (insert number) Female dwellers pregnant. I have already used the one free cancel an objective, but then within 12 hours get a similar objective.

Pretty much when you get to 200, it's time to experiment with the dwellers. Kill some off to make room for the babies.

I think they should remove this quest then you hit ~190+. I did this quest one time, i send dwellers to wasteland just to die.. pointless, we build shelter to survive but for a quest we have to kill our dwellers.

This is why you can replace a quest once a day.

You can get them pregnant, they just can't have babies. That is why I eliminate that quest with my one a day as a suggested. What baffles me is I have at least one pregnant woman now with 77% happiness, I thought they all had 100%. .