How old would you say the baby in these pictures is? 6 months? 10 months? A year old? Well, he might look big, but baby Jack Castle is just 10-weeks-old.

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Big baby Jack weighed a whopping 11lbs 11oz when he was born on February 19 – 2 weeks past his due date. "I started showing when I was about 4 weeks pregnant," new mum Diana, 29, said. "Everyone thought I was having triplets.

"Jack just kept growing and growing - by the end I was massive."

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And doctors couldn't believe the size of Jack when he was born. "One of them said I was having a boy ready for primary school," Diana said. "He was massive."

When Diana brought Jack home in Canterbury, Kent, his dad Ben, 33, had to rush out to buy new clothes – because none of the 0-3 month baby clothes would fit.

By his 10-week check-up, Jack weighed 17lbs – about the average for a 12-month-old baby.

"Lifting Jack up is like a workout, he's huge," Diana said. "We've got no idea why Jack's so massive - he's not fat or anything, he's just my big beautiful boy."

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When Diana was pregnant, she said the size of her baby was making her uncomfortable. "I did nothing different to anyone else, but at four months I was so uncomfortable and barely fitted in our bed," she said. "At 37 weeks, I was so frustrated that we tried everything to get him out early, curries, raspberry tea, castor oil, walking and sex, but nothing worked.

"My belly was constantly moving and I felt like someone was having a disco in there.

"I'm not sure but I think I've got Britain's biggest baby."

How big was your baby at birth? Let us know in the comments below.

Photos: SWNS

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