It turned out to be a 17-hour labour, but it was all worthwhile in the end.
"I'm so happy . . . it was very hard but all good in the end."
Grant said it was "awesome" to now be a dad.
"I normally don't like Christmas that much but we got the ultimate present this year."
The name Ngaia had come to Grant in a dream about three months ago, despite not knowing their baby's sex until she was born.
"I had a feeling it would be a girl and it turned out I was right."
Christmas Day was also the birthday of his best friend of 30 years, and there were already plans for shared birthday celebrations.
"It's now a birthday instead of Christmas ... this day will be a big celebration from now on."
Another baby girl was born at Dunedin Hospital about 10.40am.
An Otautau couple also got the present of their lives this Christmas — a baby girl named Sadie.
Weighing 3.2kg, she was born at Southland Hospital at 1.09pm yesterday, to the joy of parents Tamara Bray and Tyler Reece.
Sadie was due to be born on December 28 but Bray started to feel contractions as soon she woke up yesterday.
"I hated that part — it was my least favourite thing in the whole pregnancy.
"But looking at her now, everything is good."
The couple drove from Otautau to Invercargill, where their first child was born in a quiet and smooth birth.
The new parents were over the moon with their little girl.
"It is very exciting. It gives us a prospect for the future," Reece said.