Like most twins, they are dressed alike, right down to their pink and white bootees. But Kendall and Baylee are no ordinary twins – they are one in a million!

An amazing quirk of genetics means that one sister has black skin and the other is white. The effect is so striking that even their own parents have said it is hard to believe that they are related.

As non-identical twins, they were created when two eggs were fertilized by two sperm. This means they have inherited different genes from their parents as their father, Curtis Martin, is half-Jamaican, while their mother is white.

Normally, you would assume both to inherit a mix of black and white genes and be born with a similar skin tone. But, in odds of a million to one, Baylee has inherited a set of genes for white skin. And Kendall’sgenetic inheritance includes some genes that code for black skin, passed on from her mixed-race father.

The twins also have very different characters. Kendall, who weighed 6lb 1oz, is very laid-back and likes nothing more than to sleep the day away, while, Baylee, who was slightly heavier at 6lb 5oz, is ‘loud and needy’ and loves attention.

Their parents stated that this could come in useful, as she and her sister are already attracting attention wherever they go.