1 in 50000?
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1 out of 365 These odds improve if she has sex and gets pregnant about 3 months after her birthday.
not very likely
About 1 In 1000 Unless you have twins
Odds deal with sets of numbers. You haven't given a group to work with. For example, the odds of two people having the same birthday approaches certainty with a group of thirty or more, but finding someone with your birthday would require 180, just to give a fifty/fifty chance.
Believe it or not it happens very often for example three generations of women in my family have the same birthday i am the third generation I've seen it a lot more too so the odds are high. I agree, I am born on my mother's birthday and in school I had several friends who were also born on their mother's birthdays.