My son is 5 months old & I swear by his doorway jumpy! He loves it & will be in it for HOURS throughout the day. He's learning how to stand on his own in it, he can entertain himself by bouncing & swinging around if he picks his feet up, plus the toys I hook to it. It burns his energy & helps get him ready for nap time & bed bed time.
So, parents, what do you swear by?