Simon Bridges says he is in a "complete news vacuum."

National leader Simon Bridges says Jacinda Ardern's baby daughter won't do much for his poll ratings, but could end up voting for his party.

He also suggested the baby might go to school in boys' clothes to be politically correct.

Speaking to Radio Hauraki's breakfast show on Friday morning, about 14 hours after the baby's birth, Bridges was asked by the hosts whether he "hated" the baby.

"Look, I don't think it's going to do a lot to help my poll ratings, let's put it that way, but you know I don't hate it! Hate is a strong word, I should say, I wish her all the best," Bridges said.

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Bridges is then asked if it seems politically correct to have a female baby, to which he responds "only under a Labour government."

The hosts ask if the baby should be considered genderfluid at this point.

"She should be going to school like in boy's clothes right?" asks Bridges.

The hosts then check if he Bridges thinks the baby has already cost the taxpayer much money - she was born in a public hospital. Bridges agreed.

Some generic sounds of a baby crying are then played, while the two hosts and Bridges try to guess whether the baby is saying "capital gains tax" or "governing by committee."

Bridges is asked how he will make sure the baby votes for National when it turns 18.

"Here's the deal. See her parents I reckon were solid blue, I mean he's a cop right, cops vote blue. They know we're strong on law and order," Bridges said.

"Jacinda went to uni. She got some funny ideas. But that baby is going to be spend a lot of time with her grandparents."

Near the end of the interview Bridges breaks from the mood to say that "in all seriousness" he wishes the baby and Ardern well, and says the baby looks "amazing".

But he didn't seem to think Ardern would ever hear this message.

"You know why I'm saying these things right now? Because I know that nothing I say is going to make the news in the next like seven days," Bridges told the Hauraki hosts.

"I'm in a complete news vacuum."