Another Danish study published last year showed that the heavier children were at seven, the earlier they entered puberty.
His team of paediatric endocrinologists-specialists in glands and hormones-had noticed an alarming increase in the number of children being referred with symptoms of early puberty.
When you enter puberty, it might seem like your sleeves are always getting shorter and your pants always look like you're ready for a flood - that's because you're experiencing a major growth spurt.
But it's not just awkwardness-doctors now know that teenagers' body clocks go through a shift during puberty, meaning they find it hard to sleep before 11 p.m. and hard to wake in the morning.
During puberty, you might feel confused or have strong emotions that you've never experienced before.
Guys and girls will also notice other body changes as they enter puberty, and they're all normal changes.
Menstruation (a period) is a major stage of puberty in girls; it's one of the many physical signs that a girl is turning into a woman.
The kids played games and watched cartoons about puberty.
If you make talking about puberty too serious, she's gonna tune you out.
The youngest was the extraordinary case of a six-year-old Peruvian, who suffered precocious puberty and gave birth to a healthy boy by caesarean in 1939.
But one of the first signs of puberty is hair growing where it didn't grow before.
In 1997 researchers had begun pointing to a dramatic decline in the age of puberty in America.
A lot of teens notice that they have a new smell under their arms and elsewhere on their bodies when they enter puberty, and it's not a pretty one.
But the body often goes through other changes before, during, and after puberty - and sometimes these changes can be very different from the ones we expect to happen.
The findings may indicate why some women go through puberty and menopause abnormally early or late.
This growth during puberty will be the last time your body grows taller.
But after puberty boys catch up and excel in mathematical reasoning as testosterone boosts their spatial ability.
She decided to undergo electrolysis after reading a magazine article about it, but her GP told her she would have to wait until two years after puberty if she wanted it to be effective.
"The study takes us nearer to understanding the biology of the processes involved in puberty and early growth and to understand what constitutes' normal 'in growth and development," Murray said.
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