A three-year-old boy from County Durham has become Britain's youngest member of the high IQ club Mensa.

Muhammad Haryz Nazim received an impressive score of 142 on the Stanford-Binet IQ test, making him smarter than 99.7% of other Brits.

The brainy youngster is now a fully-fledged member of Mensa UK, an exclusive society for highly-intelligent people, reports CNN.

John Stevenage, the chief executive of British Mensa, said: "He is obviously a very bright young man and we are delighted to welcome him to Mensa."

His parents, both of whom who work as engineers and are originally from Malaysia, always knew that he was extremely bright.

They claim he spoke his first word at just seven months old and began reading children's books to himself when he was just two.

Haryz loves Lego and reading books

But despite high expectations for their little boy, they had little idea he would officially become one of the country's smartest children at such a tender age.

His mum Anira Asyikin said her boy is a typical 3-year-old and loves to play with Lego, read books and enjoys anything related to arts and crafts.

"We are so proud and happy for Haryz," Asyikin told CNN.

"He's not only good at academics, but he's just like other children who loves playing and growing up. We know he will give so much back to society in the future."

His parents said they always knew Haryz was exceptionally bright

Because he is under ten, Haryz had to undergo a psychological evaluation before being admitted into the organisation.

Only those ranking in the top 2% of IQs are admitted into the organisation and are commonly known as 'Mensans'.

The test consists of a combination of math, reading, memorization, and critical thinking questions.

Younger candidates under are not required to pass the official Mensa test but instead are required to submit their own evidence.

Haryz Nadzim with parents Anira and Mohd

Last month, a 10-year-old girl was revealed to have the same IQ as the late Stephen Hawking after achieving the highest possible score in a Mensa IQ test.

Freya Mangotra, from Birmingham, aced the Cattell III B test with a result of 162 and was officially recognised as 'a genius' by officials .

Kuldeep Kumar, her proud dad, told Birmingham Live : "I don't want to put too much pressure on her but we knew from an early age, two or three, that she was gifted.

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"She grasps things very fast. She can concentrate very quickly and remember things - she only needs to read or do something once to remember.

"We are blessed."