My 4 month old is nearly able to sit up on his own and has gotten rather bored with activity mats, swings, and hanging toys. The only things of his he still likes, are a bit too advanced to hold his interest long; he enjoys his stacking cups and blocks, but lacks enough coordination to not get frustrated. He only seems to be happy if we hold him constantly and wants us to keep him in a standing position most of the time.
Do any of you know of any good toys that could keep him entertained so my wife and I could get a bit of a break?