If wintry conditions exist in your area, be sure to remove any snow so that it does not accumulate on the trampoline's bed. This will cause the springs to stretch.
The long bones in the body are the long bones of the fingers, the outer bone of the forearm, the collarbone, the hip, the bone of the upper leg, the lower leg bones, the ankle, and the foot.
No child under 6 years of age should use a full-size trampoline. Do not use a ladder with the trampoline because it provides unsupervised access by small children.
Buying Guide -
http://www.cpsc.gov/CPSCPUB/PUBS/085. html