Packed to the rafters! MUM & DAD'S DOUBLE SHOCK

Luckily there was help for Rosie and Darren after the twins’ dramatic entry

- Kaisa Jillings

Marvelling at her rapidly growing belly during her third pregnancy, Rosie O'Sullivan vividly recalls texting her family and friends after the first ultrasound.

"Only one [baby], phew," it read.

But just weeks later, the Auckland mum and her husband Darren were in for a huge surprise when the 13-week scan revealed not one but two babies.

"I had already had the prenatal chromosomal testing, so I was feeling superconfident. This scan was just a formality," tells Rosie, 38.

"But then the sonographer asked, 'Do you see what I see?' You couldn't fault it, there were two babies there, like they were on bunk beds." A few minutes of panic followed as the expecting parents processed the news.