3 months. He loveddddd it at first then got bored with it. He likes to be on the go. It's sooo funny as he got older if I ever needed to get anything done I would set him in his exercaucer or jumparoo and he would put his legs out on the sides of the seat and refuse to go in and have a death grip on my shirt
4 months? My son is 10 months now and he still gets in it EVERYDAY. He freaking loves the thing. He likes to stand up all the time, and he's trying to take steps so, I think it's definitely helping his balance and learn how to control it. But, he went nuts. I had to adjust the legs a few weeks ago he was getting tall. lol.