The Duchess of Cambridge has been visiting children at Naomi House hospice in Hampshire.
Kate joined children for a tea party during her 90 minute visit.
She also visited the hydrotherapy pool where she saw children at play.
The chairman of a Hampshire hospice has said that the Duchess of Cambridge has provided a "real boost" for its families.
Professor Khalid Aziz, chairman of Naomi House, which was opened by the Prince of Wales in 1997, said: "We are delighted that Her Royal Highness has chosen Naomi House to visit at the start of Children's Hospice Week.
"Her presence has provided a real boost for our families, our volunteers and all our dedicated staff who were thrilled to meet her."
The Duchess of Cambridge Kate today visited Naomi House in Hampshire, an institution that supports children with life-limiting conditions, as part of Children's Hospice Week.
The Duchess marked Children's Hospice Week by recording her first video message at the weekend, which appealed for support for the initiative aimed at raising awareness and funds.
The Chief Executive of Together for Short Lives, Barbara Gelb told Daybreak that the Duchess of Cambridge's support has made this the "best Children's Hospice Week ever".
– Barbara Gelb, Chief Executive of Together for Short Lives
This is our best Children's Hospice Week ever, having the Duchess support our cause makes such a big difference, it's such a boost to children and families especially and also really importantly to children's hospices right across the UK.
Children's hospices are charities and they really reliant pin the public to keep them going, it can cost up to £7,000 a day to run a hospice like Naomi House.
The Duchess of Cambridge will today visit Naomi House in Sutton Scotney, Hampshire as part of Children's Hospice Week 2013.
Catherine will take a tour of the facilities, meeting the children and families who rely on the hospice's services.
The Duchess will also take tea with the brothers and sisters of children cared for at the hospice before listening to a live performance of ‘Free’ - a song written by a Naomi House sibling, Ollie Wade, as a tribute to his deceased brother.
Children's Hospice charities say their work has been given a great boost by support from the Duchess of Cambridge.
Kate's recorded her first video message to mark Children's Hospice Week. In the video, which was filmed at Clarence House, the Duchess says she's seen for herself the transformational work done for the children and their families.
ITV News reporter Piers Hopkirk reports: