DD is sooo strong and wants to stand all. the. time. so we started putting her in it a week and a 1/2 ago. She doesn't jump in it, but it saves my arms from holding her to stand all the time. She'll stay in it for 10 minutes or so then we take her out.
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Re: When did you start using jumperoo?
If you are worried, put it away and don't use it. Go with your gut.
We put DS in his at about 3.5 months. He had good head control then. It was only for very SHORT periods of time.
DMoney will be a kickass big sister