Never leave baby alone on the changing table. It may seem low to you, but for an infant, a fall from a changing table can be like a fall of several stories for an adult. If you forgot an outfit or diaper cream in another room or if you need to go wash your hands, pick your child up and take her with you.
Install window guards. You want them there long before the day your child figures out how to climb onto the ledge. An insect screen is not enough to prevent a child from falling through an open window. Get the kind of guard that attaches with screws to the frame (such as the Guardian Angel from One Step Ahead, $50-$100 depending on size; 800-274-8440 or onestepahead.com). As an alternative, buy stops that keep the window from opening more than 4 inches.
Keep furniture away from windows.
Use anti-tip (security) restraints. These pieces of hardware come with most baby furniture (and are available through One Step Ahead), so use them. They keep a bookcase, for instance, from toppling if your child climbs on it.