This conclusion was reached by American scientist Ali Binazir, who says that each of us has to complete a complex puzzle in order to be born. The odds of something going wrong at each stage of "putting the puzzle together" greatly outweighed the chances of success. 

Think about what you went through to be born and become who you are.

Your parents met. Ali Binazir estimated that the odds of meeting each other were only 1 in 20,000, but your parents took advantage. And they started dating- the odds were ever more than 1 in 2,000.

The right sperm met the right egg. If you are not a mathematician and are not used to working with big numbers, calculating the probability of a particular egg meeting a particular sperm might make you yawn. In short, given the number of reproductive cells the human body produces, the odds of you becoming yourself are only 1 in 400 trillion.

@parenting.firstcry.com/Fertilisation – When Does It Take Place?

Add to this the risk of something going wrong in pregnancy or childbirth, and you can understand that it is truly a miracle that you were born and are reading these lines right now.