Window screens are only intended to prevent insects from entering your home. The screen are purposefully designed to be removed easily, and they will not stay in place if they are pushed. Even a small child can easily push out a screen, and fall from the window to the ground.
Each window has a safety pin that can be inserted into the window frame when the window is partially open (approximately 4 inches). Once inserted, the pin can be turned slightly to keep children from removing them. This allows air circulation, while limiting how far open a window can be.
To see how to insert window pins visit our Maintenance Video page.