Technically, it is your 'birth' day. A person has one birthday, the day they were born and all the rest are techincally considered an aniversary.
People born on the same day are commonly referred to as "birthday twins" or simply as "born on the same day."
If you mean "What are eight babies born on the same day called?": Octuplets (if born by the same mother)
only if they come from the same pregnancy.
Do you mean who was born on the same birthday as Justin? If you are i know a horse called Drastico born on the same day. (march 1st.)
William Shakespere
Two siblings born in the same month and on the same day, but in a different year are simply called 'siblings.' If they both were born on the same month; day and year they would be twins.
same day as my nan
same day yo mama was born
Justin Bieber was born on the same day as Dr. Seuss, March 2nd.
twins just have to develop in the same womb at the same period of time. When they are born has nothing to do with it.
the same as a baby born any other day
thomas nash is the person who was born on the same day and died on the same day mahathisindhu