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A 16-year-old boy who stands seven feet and four inches tall is being hailed as the tallest teenager in the world.

Brandon Marshall has grown an extra five inches in the last year and doctors say he has not reached his final height.

He is believed to be the tallest teen in the world after former record holder Broc Brown, who is 7ft 8ins, turned 20.

Brandon, known to friends as 'Tiny', has just fulfilled his sporting dream by being picked for the Welsh national basketball team.

His mum Lynne Quelch, 49, said: "I can't believe he's still growing. To be honest I don't know what height he is going to reach.

"He does tend to struggle with roofs, ceilings, doorways - just everything normal size people take for granted.

(Image: SWNS.com)

(Image: SWNS.com)

"He has got a super king bed at the moment but we are having an eight foot bed custom built for him.

"It is crazy, walking down the road with Brandon. People stop him, asking for photos with him.

"He is so shy as well bless him. When people notice his height, he says 'oh here we go again, yes I am tall, yes I am Britain's tallest teenager'."

(Image: SWNS.com)

(Image: SWNS.com)

Brandon, of Bury St Edmunds, Suffolk, first hit the headlines last year when he measured 6ft 11inches.

But since then he has carried on growing and is showing no signs of stopping.

Medics have carried out a raft of tests on the teenager, but still don't know why he is growing so tall.

(Image: SWNS.com)

(Image: SWNS.com)

Previous scans showed he is missing chromosome 12, known as the height cropper chromosome.

Brandon, who has size 17 feet, said: "I was normal size up until the age of nine.

"I then had a big growth spurt. I was about 6ft when I was about 13 and I started to grow a lot more by then.

(Image: SWNS.com)

(Image: SWNS.com)

"When I was in year nine I got to 6ft 7inchs and in year 10 I got to 7ft.

"Shoes have always been a problem because I will never be able to find them and they are really expensive."

Brandon, who trains three times a week with national league team Bury Bull dogs , has now been selected for the Wales National Basketball team - as his mother is Welsh.

He is currently training for his first professional match and will be jetting off to Lithuania next month.

(Image: SWNS.com)

The teenager was able to slam dunk through a ten foot high hoop while hanging on the edge at the age of 13.

Brandon is the middle child amongst his siblings.

His 30-year-old brother, Zak is 6ft 4ins tall while his 25-year-old sister Zoe measures 5ft 6ins.

His younger brother Jordan, 12, who suffers from celebral palsy, is at an average height for his age.

Brandon's mum is 5ft 11inchs and his father is 6ft 10inchs.

Paul Sturgess 7ft 7 from the UK currently holds the title for Britain's tallest man at a height of 7ft 7inchs.