Parents.com
Keep the Numbers Low
At any age, the least risky move is to host a one-on-one. This way there's no fear of anyone getting left out. Also, the fewer kids the better the chance for quiet, independent play. There are some exceptions: Babies really don't play together anyway -- it's usually about parents -- so more can be merrier. As the kids get older (after about age 4) they can usually handle a few more friends in the fray. But be prepared: the more children around, the more involved you'll have to stay.