How do i get my u6 team to stop ball watching during?

How do i get my u6 team to stop ball watching during games? and also learn to come to the ball when it is passed to them?

Not an easy one, but I find the best way is to give them a position and also to get them to concentrate on marking an individual opposition player. You can always split the pitch in half up the middle and divide the team in half, one half can only move within the right side and the other half in the left side, gets them used to the idea that they don't have to defend/attack only around the ball!