hi,im not sure how good or bad,i always thought they were good for them, but my DD loved it from ever such a young age,nothing to do with the jolly jumper but she was late crawling and things so had to go to physio and i asked her aabout it and she said there ok for short periods of time,i couldnt see any harm and my DD just had a ball in it and shes fine walking etc.I got one second hand and it worked fine!


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. I think the problems only occur if you leave your bub in there for long periods.
. I couldn't use it for DD because it wasn't safe with her two brothers around wanting to "help" her bounce
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