Good question, Cara!
If you're going for a lower shelf, there are several attractive options which will be a great fit for your little girl. Little Red Robin offers a handmade infant shelf made of study oak with rounded corners -- it's a bit on the plain side, but with the right room accessories it can work. Community Playthings has something similar.
For jazzier options, our reader, Eve, used the Cubits shelf for her daughter Veronika's room stating, "The orange shelves are from Design Within Reach, and I chose them because I wanted V to be able to reach her toys and be able to put them and her books away, empowering her because she can tidy up herself." For our sun room, we used the Robin bookcase from Ikea.
And just a reminder, if the shelf does run a bit on the high side, be sure it is secured to the wall. Any other tips for Cara?