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What are the chances of siblings being born on the same day?
The simplest model assumes that there are 365 days in a year, each sibling having the same probability of 1/365 of being born on any of those days, and their births are independent. That implies the probability that they have the same birthday is 1/365. You can make improvements on this model is various ways.
What is it called when you and your sibling are born on the same day?
Calling them Irish twins is just an informal way of classifying siblings that are born close together. Twins are two children born from the same conception, carried during the same pregnancy, and born together, either on the same day or a day or so apart.
How common is it for 2 siblings to have the same birthday?
The odds of siblings (not twins) having the same birthday are approximately 1 in 365, assuming a non-leap year. This is because there are 365 possible days for the second sibling to be born on, and only one of those days is an exact match with the first sibling's birthday.
What is the world record for siblings born on the same day?
The seven Mangi children also hold the record for the most siblings born on the same day. The record was previously held by five children from the Cummins family (USA), who were all born on 20 February between 1952 and 1966.
How rare is it to have kids born on the same day?
If the question is asked before any children are born, the mathematical probability of having two children born on the same date is 1 in 365 (disregarding leap year). The probability of having 3 children born on the same date is 365 squared or 1 in 133,225. Pretty rare!