Stimulating play is important during the first week.  Stalking and pouncing are important play behaviors in kittens and have an important role in proper muscular development.  If given sufficient outlet for these behaviors with toys, your kitten will be less likely to use family members for these activities.  The best toys are lightweight and movable.  These include wads of paper, small balls, and string or ribbon.  Kittens should always be supervised when playing with string or ribbon to avoid swallowing them.  Any other toy that is small enough to be swallowed should be avoided.