Your child will grow into the trampoline but big trampolines are recommended for children aged 6 years and over because of the height of the trampoline off the ground and the very significant, uncontrollable forces involved in using a trampoline. However, it is a shame to waste the opportunity for your child to reap the benefits of outdoor play now. Instead we suggest that you choose equipment geared more to their current physical needs and capabilities. Climbing, swinging, and sliding are all activities which younger children love and are appropriate to their developmental needs. Wooden Climbing Frames or Wooden Swing Frames, Steel Climbing Frames and Garden Swings or slides would all be appropriate alternative choices for this age group.