Children as young as three are being treated for obesity, an expert warns. In a normal child 20-25% of their body weight will be fat but specialists report that they are seeing toddlers with up to 50% body fat.

The government has unveiled the first advertising campaign to highlight the “invisible dangers” of passive smoking. The advert, which runs from today shows dark smoke curling around guests at a wedding to demonstrate that 85% of smoke is invisible and odourless.

Ministers are considering setting up a database of fingerprints of children aged 11 to 15. Immigration minister Liam Byrne said that the idea is being considered as part of the preparations for the introduction of biometric passports and ID cards.

{mosimage}From next year, everyone over 16 who applies for a passport will have their fingerprints – along with eye and facial scans – recorded in the National Identity Register.

But Mr Byrne said ministers were concerned that teenagers aged 16-20 could end up travelling for a period on passports without biometric details if they hold a child passport issued between the ages of 11 and 15 and valid for five years.

Officials at the Identity and Passport Service have proposed the fingerprint database as a way of ensuring that all passports carried by those aged 16 or over hold biometric details, he said.

But he said no final decision had yet been made on whether to go ahead with the proposal. “These are proposals which we are looking at,” Mr Byrne told ITV1’s The Sunday Edition. “The challenge that officials have been asked to find an answer to is how do you make sure that people who are 16 and over have got biometric details recorded in their passports?

“If you only have to renew your passport every five years then potentially a 12-year-old won’t have to renew their passport until they are 16. That would mean you would have some 16-year-olds who would have a passport without biometric details. These are proposals which officials are looking at, but we haven’t come to any conclusion yet.”

A shocking new report claims that too many of the 4,300 women in Britain’s prisons are vulnerable and a danger to themselves – and already this year two have taken their own lives.

Children at risk of sex offending need more help in a bid to reverse the rising number of sex crimes committed by youngsters, experts say. The number of children given police warnings or court orders for sex offences rose by a fifth since 2003.

Access to IVF on the NHS is a lottery, with different areas adopting different rules, an MP says. Grant Shapps MP obtained data under the Freedom of Information Act showing inequitable IVF provision across England’s Primary Care Trusts (PCTs).

Physical differences in the brain may increase the chances of a person choosing to take drugs, say Cambridge University scientists. A study of rats showed variations in brain structure pre-dated their first exposure to narcotics, and made them more likely to opt for cocaine.