Kate wrote: "I recently went to visit my friend Clare Nasir’s new baby, Sienna, who was discharged from hospital just in time for Christmas.
"I know I’m biased, but she is just so sweet and gorgeous! As you probably know, Sienna was born seven weeks prematurely and Clare says she still only weighs 5lbs. She is tiny – even smaller than one of Darcey’s Baby Annabell dolls – but perfect and also surprisingly strong!
"And because she was born via Caesarean, she doesn’t have that “squished”, crumpled look some newborns get."