quadruplet:
(also ‘quad‘; plural: ‘quadruplets‘; for the right pronunciation, please click here)
couple with their quadruplets
one of the four babies born to the same mother at the same time, i.e. born in the same delivery — four babies born at one birth,
e.g.
It is found out that in the US, a pregnant woman having quadruplets will carry them in her womb for 29 weeks.
I wonder how even a careful mother can recognise a quadruplet of her identical quadruplets!
a grown-up quadruplets
