My DS is 4 months old and he gets enormously frustrated on the floor, so we try to limit floor time. He also gets impatient in the wrap (we have a new carrier on the way to try out forward-facing carries), and he'll only sit in the bouncy chair maximum 10 minutes.
Many people, here and offline, have recommended some sort of jumping thingy. I have a question: can we put DS in one if he can't fully sit up on his own yet? If we place him sitting on the floor, he can hold himself up in a slumped position with his arms, but he can't get there on his own nor sit fully upright yet. So is it too soon for one of these jumping devices? Also, is it somehow bad for their hip or spine development to be pushing all that weight off their legs so much?
We could get this kind, a jumperoo. Or there are these ones
which hang from a doorway. The jumperoo seems really expensive, which would be a lot to spend if he doesn't end up liking it. But the door-hanging one would be a hassle to always set up and take down...or be in the way if we left it up. So, which of these would you recommend and why? Or do you have a different type? TIA! 
Many people, here and offline, have recommended some sort of jumping thingy. I have a question: can we put DS in one if he can't fully sit up on his own yet? If we place him sitting on the floor, he can hold himself up in a slumped position with his arms, but he can't get there on his own nor sit fully upright yet. So is it too soon for one of these jumping devices? Also, is it somehow bad for their hip or spine development to be pushing all that weight off their legs so much?
We could get this kind, a jumperoo. Or there are these ones













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