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Both received Christmas presents in the form of babies born at Dunedin Hospital's Queen Mary maternity ward.
Rohan Savarimuthu, weighing 3.25kg, was born at 4.30am, followed by Maia Violet Williams, weighing 3.22kg, at 12.50pm.
Maia, Aimee and Andrew Williams' first child together, arrived three days early.
"It's the best present ever," Mrs Williams, of Stirling, said.
However, it meant it did not feel like Christmas for the couple, who were already planning midyear parties to celebrate Maia's birthday.
Tony Savarimuthu and Rexy Arulanandam, of Dunedin, had two due dates for Rohan.
"We thought he might come on our wedding anniversary on the 23rd, but no, he came right in the middle," Mr Savarimuthu said.
Rohan was their first child and the first grandchild for both sides of the family, so there was much to celebrate, they said.