He says Taylor had been prescribed a special formula. "Both my girls suffer from allergies and when Taylor was just a week old she was taken to hospital because she came out in a bad rash and was having trouble breathing. We mentioned Keira's problems to the staff so they tested Taylor, the results came back positive, and we were prescribed a special formula, EleCare, for her.
"I'm not against breastfeeding, but I feel strongly that everyone's got the right to make the choice, bottle or breast. Not all women can breastfeed, not all babies do well on breast milk."
How he and his partner Candice feed Taylor and her big sister Keira is nobody else's business, he says.
The ad was made by the Health Sponsorship Council, now part of the Health Promotions Agency. The council removed the bottle-feeding image after seeking the views of La Leche League and Plunket.
Weepu says: "La Leche reckoned that due to my high profile the public might think I'm an advocate of bottle-feeding over breast. It didn't take long for the media to get wind of what was happening, social media, too, and it seemed suddenly that everyone had an opinion on the issue of bottle versus breastfeeding."
La Leche League bore the brunt of the criticism. This week spokeswoman Lisa Manning, having read the relevant part of Weepu's book, says La Leche League only wanted the Health Sponsorship Council to avoid conveying conflicting messages in government health promotions.
Weepu is right in calling it "a media storm", she says, and La Leche felt misrepresented as the story grew. "We never mentioned Piri in our response or questioned his role as a father or his parenting choices," she says. "We agree wholeheartedly that Piri and all parents have the right to decide how to bring up and feed their children."
Neither Plunket nor the NZ College of Midwives would comment this week but in February chief executive Karen Guilliland said her organisation opposed the image. "We just figured that Piri Weepu was so loved that whatever he did would carry a huge weight."
As for the ad's makers, asked whether the fallout had damaged the campaign or affected the way ads were made, Health Promotions Agency spokeswoman Lynne Walsh would say only that Weepu had done a great job in promoting the smokefree message.