unless Bethesda will raise the maximum number of dwellers(which will be great) the only solution u have is to send in the wasteland two dwellers( i sugest the lowest level u have), with no outfit and weapon and let them die ; after that the pregnant ones will give birth. i had to do this myself for a pregnant one and for other dellers which i earned from lunchboxes and they were higher in abilities and level in comparasion with some i had in the vault.
u're welcome i know it svcks! maybe bethesda will update the game with some new features among them the maximum of dwellers, or at least do something in order not to receive a dweller in a lunchbox if u are maxed out
Actually, there is one more step that is needed after they die. You have to click on the "Remove" button.
Of course, Murphy's Law may kick in and when you check on them they may have six or seven Legendary items. Then you get to decide whether you want the items more than the baby.
It should be noted that Murphy's Law applies to itself. So if you send a dweller out with the stated purpose of dying in hopes that it will collect some much needed gear, that dweller will die a slow and painful death for naught.
What I did was killed off a dweller in the wasteland to get my number down to 199. Then each time it hits 200, the unlucky newcomer is sent out into the wastes to perish
My vault has had FOUR babies since 200, and none were pregnant prior to the max. So something is up. I haven't counted my dwellers, but I should be at 204. I do have one pregnant woman that won't pop. I have five outside due to cards.
Dwellers should die of old age, then there would be some kind of sense to make new ones and I wouldn't have to kill them on purpose.