Essentials Child-Proofing Kit Safety 1st Essentials Child Proofing Kit is a must-have for children 6 months and older. Door knob covers will detour your child from falling down steps or locking themselves in a room. You will now be able to keep those wandering eyes and fingers out of cabinets and drawers with the included safety latches. Most electrical outlets in your home are right at your child’s level. Be sure to keep your loved one safe by covering the outlets with the plastic plugs.