The question now is whether that is the population before or after the babies were born. So i'll do both for you.
The birth rate is 1,214%
So if it was before the babies were born, the population is at a value of 100% and we need to add 1,214%
By using cross multiplication:
I find x = 29 620 277,1
So lets say the population would then be 29 620 277 people. Subtract the original value from that. (Or you could just have used 1,214 instead of 101,214)
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If that was after the babies were born, then the population is now at 100% + 1,214% = 101,214% and then we need to find what the population was at 100% to find the original amount of people, so that we can find the number of babies that were born.
x = 28 913 984 (I rounded it like above)
Now subtract this from the initial value to get the number of babies that were born.