Olivia Uffindell's mother left her alone for a moment to get something out of the house in Croydon, The Daily Telegraph reported. Witnesses said a strong gust of wind knocked the stroller over.
Bad weather has claimed at least two other lives since Friday. Gary Windle, 25, was found dead Saturday afternoon about half a mile from his home in Burnley, Lancashire, while a 66-year-old woman in Cornwall was killed Friday when a landslide fed by heavy rain inundated her apartment in Looe with mud.
In Wales, RAF Anglesey airlifted a family from a snowbound farmhouse near Wrexham, the BBC reported. Ben Massam said he and his wife burned old furniture to keep warm but decided to summon help Sunday because they were worried about their 16-month-old son.
"You can walk over the washing line, there's that much snow," Massam said. "You can't see any of the cars. The cars are all buried and I mean literally buried -- they're gone."
In northern Wales, mountain rescue teams had a busy weekend helping stranded drivers and transporting people in need of dialysis and other medical services, the BBC said.
The bad weather left thousands of people without power. The entire Isle of Arran in the Firth of Clyde in Scotland lost electricity last week.
In Lancashire, Windle took a taxi home after spending Friday evening with friends, the Burnley Express reported. The taxi could not make it all the way because of the snow, and Windle apparently decided to walk the rest of the way.
His body had to be removed by helicopter after it was discovered by a farmer because the snow kept vehicles from getting to the area.
Cold weather is expected to persist through the week with forecasters saying parts of Britain could have a white Easter, the Telegraph said. The lingering winter has been good for one group of businesses with travel agents reporting reservations for Easter getaways to warmer climes are up 50 percent over last year.