Some parents get a false sense of security with all the little gadgets to protect children, and forget that you still have to keep a constant eye on them. After having a child, most parents go through the routine of putting outlet covers on all electrical outlets, locks on the cupboards, safety gates on all stairways and even a lock on the refrigerator and on the toilet. These devices are great for preventing accidents around the home, but they are not foolproof. When you put up a safety device, make sure you child isn't watching.
Little children learn things very fast.
Here's one example. While at his Grandparents house, one toddler watched his grandmother put an outlet protector in, and that was all it took for him to figure out they could just as easily be removed. She had just finished putting the last one in and went into the kitchen, when the boy walked in and presented her with a handful of outlet protectors. Kids are fast. Parents need to be faster.