How can I gather new dwellers quicker?

I have only recently started playing Fallout: Shelter, and so far I have 15 dwellers in my vault. I have a fairly good constant supply of power, food and water and the overall average happiness across my vault is 93%.
However, things just seem really slow considering that I haven't been getting many new dwellers in a while. Usually, I seem to be getting only about one or two per day.
Is this a fixed amount no matter what, or are there any ways of getting new dwellers quicker?
Best Answer
Breeding
Put a male and a female dweller together in the residential area. If they're unrelated, they will (usually) hook up and the female dweller will become pregnant. It takes 3 hours before the baby is born and a further three hours before they become an adult. With the right breeding policy you can readily double your population in a day.
Note that pregnant dwellers will not fight, nor go to the wasteland, and that children eat and drink water but cannot work
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How long does it take for new dwellers to come?
Typically you will get someone every 6 to 12 hours guaranteed. If you are trying to max out your dweller capacity you can always do the time method. In case you are unaware of the time method I will explain, if you manipulate the time on your computer can 1) collect resources faster and 2) collect new dweller faster.How do I get more people to come to my vault in Fallout 4?
The simplest way to increase the population in Fallout Shelter is by making babies. Just after the tutorial ends, about 12 dwellers from the wasteland show up to your vault door. But you need to match the pairs(a male dweller and a female dweller) and put them in Living room.Why are there no dwellers coming to my vault?
New dwellers only pop up at your doorstep in the beginning of the game. After that getting them pregnant or building a radio station will give you new dwellers. Check your building plans to see when the radio station becomes available. It depends on the number of dwellers you have before you can build that.How long does it take for dwellers to give birth?
Pregnant dwellers will give birth after a few hours if they are happy and there is enough space in the Vault. If there is not enough room, either upgrade or build additional Living Quarters.Get More Vault Dwellers | Fallout Shelter Tutorial
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Answer 2
In addition to the other two answer, I suggest you grow/breed your population as you can afford it, because falling below the water/food threshold can cause downward radiation poisoning cycle that takes a day or two to get out of. Also, try to build resting chambers on second or third level to the right side of your elevator since raiders (NPC's who will come to your vault to cause trouble) will visit your vault from top to bottom and left to right. I put my most well equipped dwellers on the first chamber they visit on the top floor so nothing to the bottom is affected.
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