Two parent bloggers have warned of the dangers of shielding babies' prams with a muslin cloth - after the fabric heated up their pram by 13 degrees in just seven minutes.

Parents-of-two JK and Charlie posted a video on the Channel Mum YouTube channel warning against trying to protect infants from the sun by covering their prams with a cloth.

The bloggers described a controlled test they carried out over two seven-minute time spans - which showed the pram heat up by five degrees more when covered by the muslin.

JK and Charlie placed a toy doll in a pram in direct sunlight in their back garden on a day on which temperatures reached 30 degrees.

Over a period of seven minutes, when left open and uncovered, the pram heated up from 23.3 degrees to 29.9 degrees - an increase of just over 6.5 degrees.

But over the same amount of time, when covered by a muslin cloth, the pram heated up from 22.0 degrees to a sweltering 35.1 degrees - heating up by 13 degrees.

The video has already been watched 140 times on the Channel Mum YouTube channel.

Mum Charlie said: "That is a good five degrees hotter with the muslin cloth on than without it - and we only did that for seven minutes.

"If we had left that going for another 10 minutes, or 15 minutes, God knows how hot it would have got in there."

She added: "It's a mistake that lots of parents make. We did it with our first baby, because we didn't know any better.

"But I think this really, really highlights why you should never put these over your pram."