We all love to open the doors and windows to let in a cool breeze. But remember that children are natural climbers and may not understand the risk. Don't underestimate a child's mobility; children begin climbing before they can walk. A window screen will not stop your child from falling from a window.
• Move furniture away from windows and balcony rails to discourage climbing to peer out.
• Install window guards on windows above the ground level. These act like a gate in front of the window.
• Or, fasten the windows, so that they cannot open more than 10 centimetres (four inches). Children can fit through spaces as small as 12 centimetres (5 inches) wide. In either case, ensure there is a safe release option in case of a house fire.
• Young children are avid learners - they may be able to unlock doors and windows to gain access to dangerous areas without you realizing it
– BC Ambulance Service