See the light. Many games are played in late afternoon or early morning, when the sun is low in the sky. If the sun is behind your child, you may get a silhouette. If the sun is toward the side of your child, you may get a harsh shadow. For best results, try to shoot with the sun at your back.
Overcast days are good for taking pictures because there are few shadows.
Choose film wisely. To capture action on the field, use fast film that reduces blur. If you use a digital camera, select a fast ISO setting. Telephoto lenses and telephoto zooms bring you closer to your subject. Anticipate the moment.