Record Breaking Birth! Heaviest Baby Born in Canada

Canada couple Britteney and Chance Ayres suspected their baby would be a chunky little guy, but they were not prepared for just how big their newborn would be or that he would be the heaviest baby born at their hospital.

Their little man, Sonny, arrived earthside weighing an epic 6.578kg. That’s more than double the average weight of a typical newborn! Whoa.

Just how big is 6.57kg?

The average weight for a newborn born in Australia is around 3.35kg so this is a pretty big difference! While it’s not known what size of clothing Sonny was wearing at birth, we predict he would be in at least size 00 or size 0.

While every baby is different, most babies hit the 6.5kg mark around four or five months. So, essentially, Britteney was carrying a baby the size of a four-month-old in her belly! Incredible, right!

Record breaking baby born in Canada
Sonny’s details at birth. Source: CTV News

Just to put things into a bit of perspective, a bowling ball is typically 6kg while a mini refrigerator is also around this weight mark. Plenty of prams are also around the 6.5kg weight.

Record breaking birth weight!

The baby was born in Cambridge Memorial Hospital in Ontario and has officially broken the record for the biggest baby born in that particular hospital.

Sonny was born on 23 October 2023 via C-section. He is the couple’s fifth baby. Sonny’s siblings were also big at birth.

Heaviest baby born in Canada at 6.5kg
Sonny with his proud parents. Source: CTV News

As Britteney told Good Morning America,

“[Marigold] was born 13 pounds, 14 ounces [6.3kg]. And Lucky, he was born 13 pounds, 11 ounces [6.2kg].”

Chance Ayers told Good Morning America that Sonny’s size was unbelievable.

“Never in our wildest dreams did we think he’d be that big,” he said.

Born one week early 

Sonny was born a week before his due date of 31 October 2023. The proud mum explained that her pregnancy was normal and Sonny is settling in beautifully at home. He was. born healthy, happy and absolutely adorable!

Hospitals heaviest baby born 6.5kg
How cute! Source: CTV News

He’s our last one … a ray of sunshine. He’s beautiful,” Chance Ayres told Good Morning America.

“Anyone that sees him has an enormous smile, even if they don’t recognise [him] from the news. They still see him and say, ‘Wow, what a baby that is.'”

Heaviest baby born in Canada
Source: CTV News

Big baby boom

Sonny isn’t the only little one making headlines this week. Earlier this week we shared a story of an American mum who gave birth to a 4.5kg baby boy.

This isn’t the record-breaking weight at birth, but mum Maira did experience something pretty shocking. Due to her intense pushing during labour, the mum ended up bursting the blood vessels in her face. She even had blood coming out of her eyes. Holey Dooley!

Mum pops blood vessel while giving birth
Source: TikTok

Maira shared a TikTok video of her labour experience which starts nicely enough as her husband straightens her hair during early labour and ends with her showcasing her eyes. Due to the pushing and popping of the blood vessels in her eyes and also in her face, the whites of her eyes are no longer white, but blood red.

This isn’t super common but it can happen and it’s not considered a concern. In general, your eyes will return to normal in about two weeks.

What’s the heaviest baby born ever? 

According to the Guinness Book of World Records, the heaviest baby born to a healthy mother was a boy weighing 10.2 kg (22 lb 8 oz) who was born to Sig. Carmelina Fedele at Aversa, Italy in September 1955.

Other contenders include:

  • Victorian newborn Brian Liddle Jr was born in January 2017, weighing in at 6.08kg. His superstar mum birthed her son naturally using only gas for pain relief and “positive thoughts”.
  • Willow Amey, born in March 2020, tipped the scales at an impressive 6.6kg and could possibly be the heaviest baby born in Victoria. EVER! 

What was your baby’s weight at birth?

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Avatar of Jenna Galley

Born and raised in Canada, Jenna now lives in Far North Queensland with her tribe. When the mum-of-three is not writing, you can find her floating in the pool, watching princess movies, frolicking on the beach, bouncing her baby to sleep or nagging her older kids to put on their pants.

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