Never, ever leave your infant's side, even for a second. "Within arm's reach" is the maximum recommended distance.
Don't multitask -- talk on the phone, organize toiletries -- while you're in the bathroom with your baby.
Use as little water in the tub as possible. About an inch is enough to clean your baby and allow him to have fun splashing.
Stop using the seat as soon as your child attempts to climb or wiggle out of it, or becomes too big to fit comfortably inside it.