My daughter is 7 and has hemi spastic cp. It's mild and since her last surgery we've stretched her heel every single night (after she recovered) for 30-45 minutes. It has improved her gait so dramatically that she no longer has to wear her AFO!!!!! Through her life she's been through countless botox injections, two heel cord lengthenings, 4 or 5 castings, etc. It's a guessing game.....the doctor admitted that. They do things with the HOPE that it will work and some times it just doesn't. STRETCH but ask your doctor or a PT if you're stretching correctly! You don't want to stretch the wrong muscle group. I hope I've helped and would be more than willing to answer any other questions (if I can). Wishing you the best of luck!