Britain's youngest parents: Mother, 12 and Boy 13

A 12-year-old girl has given birth to her 13-year-old boyfriend's baby making them Britain's youngest parents, it was revealed today.

The girl, who cannot be named for legal reasons, had a daughter last weekend after conceiving when she was still at primary school.

She was 11 then, and is now in Year 7 at school. Her boyfriend, who also cannot be named, is in Year 9 at another school.

The pair have the lowest combined age of any British parents on record. She, at 12 years and three months, is five months younger than the UK's previous youngest mother, Tressa Middleton.

Their child weighed 7lb, which is close to the UK average for a girl of 7lb 4oz, The Sun reported today.

At 27, the girl's mother, who was a teenage mother herself, is also now one of Britain's youngest grandmothers.

The parents, from north London, have been in a relationship for a year and say they are 'totally in love'.

They met over Christmas 2012 when she was 10 and he was 12, it was reported.

Yesterday, the new mother went to a register office to register the birth with her own mother and another woman.

A source told The Sun: 'Both sets of grandparents are incredibly supportive. It's a very difficult situation because the parents are both so young - but their families are right behind them.

'The baby's mum and dad have been in a relationship for more than year, so this isn't a fleeting romance. They intend to stick together and bring their daughter up together.

'They're very into each other, totally in love. She is obsessed with him. She sees this as true love. They want to get married.'

The source told how classmates at the mother's school have been left shocked. The girl only left classes last month and, it was said, didn't look pregnant.

Britain's youngest mother, Tressa Middleton, became pregnant at 11 and gave birth aged 12 in Edinburgh in 2006.

The youngest father on record is Sean Stewart, of Bedford, who became a father at the age of 12 in 1998.

However, Office for National Statistics figures released in February showed that the UK under-18 conception rate remains the lowest since 1969 at 27.9 per 1,000 women aged 15 to 17.

The number of pregnancies in those under 18 fell to 27,834 in 2012 compared with 31,051 in 2011 - a ten per cent drop.

Some 5,432 under-16s fell pregnant in 2012, compared with 5,991 in 2011, a fall of 9.3 per cent.

Among under-16s, some 3,251 pregnancies resulted in abortion - 59.8 per cent of the total. This is down on 60.2 per cent the previous year and 62.5 per cent the year before that.

The figures also revealed that 253 girls under 14 fell pregnant in 2012, fewer than the previous year, with almost three-quarters having an abortion.