Three of the four children injured when inflatables blew over in high winds during a scouting event near Kendal have now been released from hospital.
The incident happened at the Westmorland County Showground at around 3pm. Two and a half thousand scouts, cubs and beavers were at the event attended by TV adventurer Bear Grylls.
A nine-year-old boy from Carlisle is still believed to be under observation in the Royal Preston Hospital.
Chief Scout Bear Grylls is flying into Cumbria to join more than 2,500 youngsters for a County Fun Day.
The event is taking place at the Westmorland County Showground near Kendal.
Bear will fly in by helicopter as part of his "Bear in the Air" campaign to visit every area of the UK during his time as Chief Scout.
The young people will include Beaver Scouts, aged 6 to 8, Cub Scouts, 8 to 10, Scouts, 10 to 14, Explorer Scouts, 14 to 18 and members of the Scout Network, aged 18 to 25. Events include a massive It's a Knock Out, a climbing wall and circus skills.
Wrapped up against the biting cold, the Duchess of Cambridge arrived wearing a green woollen hat, fleece, green parka-style jacket, dark blue jeans and wellies with a Scout's red, white and blue neckerchief, tied in a friendship knot.
As snowflakes were blown around the fells above Lake Windermere at the Great Tower activity centre near Newby Bridge, the temperature was estimated to have plummeted to minus five with the wind chill factor.
Kate, five months pregnant, spent about an hour outside with adult scout volunteers and youngsters.
The Duchess of Cambridge joined 24 other adults on a training day to learn scouting skills to pass on to children at their own groups.
As part of the day Kate learnt how to make "twisters" or "dampers".
She kneaded dough in a bowl for several minutes before making elongated twists. After washing the dough mix off her hands Kate wrapped a twist of the messy mixture around a twig stripped of bark which was placed over the open fire ready to toast.
The volunteers' efforts had mixed results, with the Duchess laughing and giggling with the others as some of the twisters dropped into the flames.
"I'm not sure if these are going to look particularly edible," Kate laughed.
After several minutes toasting on the fire Kate pulled off a piece of the bread and, rather gingerly, popped it in her mouth. "Oh, its actually not bad," she told the group. "It is quite sugary though."
The Duchess of Cambridge braved the snow to visit a Scout camp in the Lake District.
Kate, who is a volunteer in the Scout Association, joined fellow adult volunteers as they trained to work with Beaver and Cub Scouts at the Great Tower Scout Camp near Newby Bridge in Cumbria.
She will use her training to help look after a group of Cub Scouts from Cumbria and Manchester taking part in a pack holiday event at the 250-acre activity centre close to Windermere.
A group of disabled and non-disabled Scouts will climb to the top of Scafell Pike, England’s highest mountain to create the English Paralympic flame.
At the same time flames will be lit on top of the highest mountains of Wales Scotland and Northern Ireland.
Scouts will use the traditional technique of rubbing flint together to create sparks and kindle a flame. The Flame will then be placed in a miner's lantern and taken to London where it will be the focus for a day of Paralympic celebrations.