i wish thre were some kinda growth chart for balls. i am working on one with my spiderball, but it will take time to complete cuz he is a baby. wish i could of done it w/ my others but have aquired them when they were older. but still docuument thier wieghts,sheds,feeds. i guess it woul vary cuz some are better eaters than others. there are just so many variences.