There must be something in the water in Parramatta and Holroyd.
Nurses at Westmead Hospital's maternity ward were seeing double after four sets of twins were born in a week.
The eight babies made up about a fifth of the ward's nappy-wearing population.
Though a set of parents are put on double duty about every fortnight at the hospital, there have not been this many twins in the ward at one time before.
Merrylands resident Hakaumotu Veatufunga said he didn't quite double over when he found out his partner was expecting twins.
"We were both nervous and we just decided to leave it a surprise what gender they were," Mr Veatufunga said.
His twins, a boy and a girl, were born on Thursday.
The hardest part for the new parents wasn't having double the trouble but naming the new additions to their family.
After two days of indecision, they finally decided to draw the names out of a hat. Abraham and Gabrielle was the end result.
"They are all healthy and well so far. It's nice to see them together," Mr Veatufunga said.
Although the eight parents might have their hands full, they're happy to have twice as much to love.