We have an open-style Graco, that we've used with all 4 of our kids (started using it 11 and a half years ago!), and out 2-year-old can still use it... Her legs are a bit long, but she can hold them in such a way that it's not a big deal... And, of course, our 10-month-old uses it. It's great, and it's served us well!