User blog comment:SaenihpNnylf/Cub's Age/@comment-27169958-20160203213039/@comment-27169958-20160204101728

Well, his mobility is great in those episodes, including more, but it was for the sake of the jokes and the plots. Especially Having a Ball with the rope. Let's just say he varies between a baby and a toddler. Perhaps 3 is the upper limit I'd accept for him.