HER SPARKLING BABY BLUES

Those twinkling eyes are one of Princess Charlotte’s defining features — but her baby blues may not stay that way for long.

‘Many babies will have blue eyes in their first months before the iris – the coloured part of the eye — is fully pigmented,’ explains Dr Chicot.

‘We can expect lots of changes in the next three months as melanin — a natural pigment responsible for colour — builds up in her iris and her eye colour settles. We will need to wait until her first birthday to really know what colour eyes the princess will have.’

This is because babies are born with little or no melanin, giving them pale skin and features. As they grow, the melanin naturally increases, colouring their eyes and hair.

The final hue doesn’t just depend on her parents’ eyes, Dr Chicot adds. Though the Duchess’s eyes are hazel/green and Prince William’s are blue, Charlotte’s could be anywhere in between.

Brother George has brown eyes, while the Queen and Prince Philip both have blue eyes, Carole Middleton’s are hazel and Michael Middleton’s are green.

‘eye colour depends on several genes; it’s not a simple dominant trait,’ says Dr Chicot. ‘This means Charlotte could go on to develop blue, green, hazel or brown eyes.’