Ventilating and letting fresh air in? Let’s always keep in mind that extra precaution is essential when there are children around. Before opening windows there are a few child-proofing considerations:
• Install limited-opening hardware, a window stop, which only allows a window to open a few inches. Or install a window guard – be sure it has a child-proof quick release mechanism.
• For a double-hung window on an upper floor, open the top sash for ventilation and keep the bottom sash closed and locked.
• Remove furniture from beneath windows – kids climb.
• Screens keep bugs out - they do not keep children in. 
• Go Cordless - Children can become entangled in window shade cords, which can have fatal consequences.