My son is 8 - 62# and 52", and he is still in a 5 point harness. The Britax Frontier we have goes up to 85# and 57". He is on the bigger side for a 2nd grader and has a long torso, but the straps are still above his shoulders. Keep your child in a 5 point as long as you can. The Frontier looks like a booster, so we tell him it's booster, and he has no issues with being in a harness.