This can be done by placing them in living room.

To boost the happiness of dwellers in a quicker way, get them to have sex.

Sell out the weapons that have damage from 0 to 1 since it is equal to dwellers fist damage.

Place an armed dweller next to the room near the Vaults Door.

See to it that the dwellers in non-production rooms are kept away from the generator at the time of power loss as they will be the ones who be shut down first.

Let them explore more before you recall them

The dwellers do not take any damage when they are returning to the vault from the exploration of wasteland.

If you get an objective where in you need to equip the dweller with weapons or clothes, you can catch any dweller who is already equipped.

Higher the level of his enemies, better will his experience be.

The experience of the dweller will increase with his exploration of wasteland.

(Try not to skip the objectives which awards you with the Lunchboxes) The Nightwear enhances the Charisma by 3, this helps to produce and increase the population.

If you get a Nightwear try it on the dweller whom you want to go have fun in the living room with another dweller (opposite sex).

But note that only one object can be dismissed a day.

If players are unable to finish certain objectives then it can be removed by using 'X' button.

Thereby helping in increasing the population of the vault.

Wear Nightwear and go to the living room with dweller of opposite sex as this will improve the Charisma by three points.

See to it that a new power room is created when the current one is full, note that it won't take you any resources.After consummating, you can assign the dwellers back to work as the baby takes 8 hours (real time) to take birth in the vault.Players can name their dwellers based on their stats and this will help them to keep track.Do not arm pregnant women with weapons since they are capable of protecting themselves in the eventuality of a raid or fire breaking out.

More the kids, more the mouths to feed with less work. Players must see that they maintain the ratio of kids and working dwellers since kids cannot work unless they are full grown.Some dwellers can be assigned to search the wasteland. Assigning more than one dweller to one work will help player boost their work.Do some mixing of the pairs if you want to have a baby, since same bloodline dwellers will not breed or have sex.This helps in getting some high-level SPECIAL stats for the baby. Try to grow SPECIAL stats for your dwellers and only then proceed to populate the place with babies.

Fallout shelter baby tips