A total of 953 mothers gave birth to twins or triplets in 2008, compared with 537 mothers in 1978. Twins were born to 475 first-time mothers, and another six new mothers had triplets.
In 2008, 189 mothers who gave birth to twins or triplets already had at least two other children.
Mothers having multiple births tend to be older. While just under half (49 percent) of mothers who had single births in 2008 were aged 30 or over, for multiple births this rose to almost two-thirds (61 percent).
Here are the twin stats of the statsnz website. Hope that helps ladies
Edited by Peanut