Does anyone have a larger baby? If so, what type of activity seats (ie: exersaucers, jumpers, etc) did you use/like? My DS is 4 months old and already over 27 inches tall and almost 18lbs. I know a lot of the seats say the baby shouldn't exceed 30 inches in height so I am wondering if they are even worth it. I want to make sure he is able to play and enjoy himself but I didn't know if they would be a complete waste.