The question makes an assuption that is not strictly true. Some may have such problems others will not.
FIRST BORN FIRST BORN
Cain and Abel were the first children in the bible, both were born to Adam and Eve.
It is unknown which of Poseidon's children were born first. The myths are not dated.
when you were first born because you kept on waking up for food
Shakespeare's children were Susanna, Judith, and Hamnet. When they were first born, they were infants.
Peter Sleep was born in 1957.
It isn't known how old Noah was when his first children were born.
The children don't laugh. It is the twitching of the facial muscles. It is also called witch's smile.
He didnt have children!
Colin Sleep was born on 1944-10-08.
The noun and adjective are one word, firstborn (first of children).
Fourth of seven children