A girl fell about six metres from this second-storey window onto the concrete below on Monday. (CBC)

A Calgary toddler is fighting for her life in the Alberta Children's Hospital after falling from a second-storey window at her McKenzie Towne home on Monday.

Paramedics rushed the two-year-old from the house on Prestwick Boulevard S.E. to the hospital around 12:30 p.m. in critical condition, said Stuart Brideaux, spokesman for Alberta Health Services in Calgary. He said the girl fell about six metres onto concrete.

It's not known how the child got out the window.

"This type of occurrence we do see increase in the summer months ... when people at home are choosing to open their windows for obvious reasons," said Brideaux.

He reminded parents and caregivers that direct supervision is the best way to prevent falls from any height, advising that anything a child can climb on, such as a change table, stool, crib or dresser, should be moved away from a window.

"The age group that's typically most affected by this are children aged one to four," Brideaux said. "The concern there is they have a high level of curiosity and a very low level of fear, and if you mix those two together, they may not understand the risks of perhaps even leaning against an open window or a screen."

He also recommended that parents install devices that prevent windows from opening more than 10 centimetres and not assume that window screens are sturdy enough to keep a child from falling through.

"Screens are not safety devices. They're only designed to keep bugs out, not to keep children in," Brideaux warned.