Melissa Keevers, 27, and her partner Rosemary Nolan, 21, who already have a child through donor insemination, spoke to Australia's Woman's Day magazine of their amazement at the news.
'I was in shock for weeks,' said Melissa, 'It took me a long time to get my head around what was happening. But now I've come to terms with it, I'm excited. During the scan the doctor asked us if we wanted the news, but as he looked pale, we were worried something was wrong, he then told us he'd found five gestational sacs meaning, if all went well, we'd have five babies. We can't repeat what we said next!'
The babies were conceived with the same donor sperm as the couples' one-year-old daughter, Lilly, but Melissa had no treatment to increase her fertility: 'People don't know whether to congratulate us or commiserate,' Rosemary told reporters, 'But we think it's a miracle and couldn't be happier.'
Rosemary, who is originally from Ireland, told how her father said he would never be a grandad when she first came out as gay.
'So I proved him wrong!' Rosemary said. 'Two ladies and six babies!'