I personally would suggest a jumperoo.....it has all the activities of a exersaucer...toys, etc...but they also build strong leg muscles from jumping.
Sarah has been using hers for over about a month or two now..and she was only about 22 inches when she started and she could reach the ground.....she does really good in it.
We have the Fisher Price Rainforest Jumperoo..and it has adjustable heights for when they get bigger. Sarah is still on the lowest, but there are two more heights to go too!
Sarah also has a walker and she can barely touch the ground..just tippy toes..she just sits in it and plays with the toys we put on it.
I bought my son one of the Baby Einstein "exercauscers", you can adjust it to three different levels. I had him in it when he was about two months. I just put a towel around him in, or folded up in the front and back so he'd fit in it better. I also put him in one of the old style walkers (hand me down) I did the same thing with a towel, and although he could barely touch the floor, and only go backwards, he loved them both. Especially the Baby Einstein...it has 9 different toys/noise makers on it, and he loved looking at them and playing with them. When I moved to Korea I couldn't take it with me and it was too expensive to ship, so I jumped on buying the first one I saw when I got here, and he still uses it at almost a year old. It has three legs that you can put down on the sides or lift up so they rock a little while they're in it. It's worth checking out, and it is cheaper than some of others...
I also like the jumperoos but Jazmine was too small to use hers until about 4 months.
Walkers are not recommended because baby can actually get hurt with these (fall down stairs for example).