The box says 4 months....I think they have to have pretty much perfect head control to use it though...wouldn't want them to flop forward/backward and smack their head on the plastic.
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We have the Rainforest one and I started DS in it at 2 months (only for a few short min a day at first). I read as long as they can support their head on their own they could use it and we never had a problem.
BFP#1 on 02/14/09 BIRTH to Mason 6lb9oz on 10/12/09
BFP#2 on 5/28/11 EDD 2/1/12 Natural M/C on 6/13/11
BFP#3 on 1/20/12 EDD 9/30/12 Natural m/c on 1/27/12
BFP#4 on 4/23/12 BIRTH to Isabella 7lb1oz on 12/19/12
DD's just over 3 months and she loves her jumperoo... I don't care what the box says (ours didn't come with a box), if it keeps her happy, I'll use it!
Re: Jumperoo
BFP#1 on 02/14/09 BIRTH to Mason 6lb9oz on 10/12/09
BFP#2 on 5/28/11 EDD 2/1/12 Natural M/C on 6/13/11
BFP#3 on 1/20/12 EDD 9/30/12 Natural m/c on 1/27/12
BFP#4 on 4/23/12 BIRTH to Isabella 7lb1oz on 12/19/12