I plan on starting to use it soon, so around 4 months. I know some parents put their DC in earlier but DH has just recently gotten very good head control. L hasn't been jealous of H yet but I think she might get mad that he is using her jumperoo.
I think it was 4 months that we started letting him hang in it, but closer to 6 when he really began to jump around. Until then, he just liked feeling his feel dangling.
Re: When did you start using the jumperoo?