There were 5 sets of twins called Poseidon's first born
Twins have names by which they are usually known; if you need to distinguish between the one who was born first (if only by mere minutes) and the one who was born second, you can call them the older twin and the younger twin.
Twins have been born since man has existed and it is difficult to know when the very first pair were born. The first documented twins were born in American in 945 A.D.
Conjoined twins are born attached. Sometimes they are called Siamese twins, too.
A set of twins (2 babies) is called twins. Seven sets would still be twins. 7 babies born together (not twins) would be called septuplets.
Conjoined twins. The older terminology was Siamese twins, after the first recorded twins in the country of Siam (now called Thailand).
Fraternal twins.
when two babies are born at the same time are callled twins!
They are called twins.
They are called twins.
Cain was born first, followed by Abel. They were not twins; Cain was the firstborn and Abel was his younger brother.
Twins Also, they are called identical twins if they come from the same egg