These socks fit my baby well, true-to-size without pinching her ankles, and most importantly they didn't fall off with her constant kicking.  Most socks I've found tend to work their way off, but since these have short cuffs that don't fold over, she couldn't get a grip to push them off her feet.  While thin, they made a noticeable difference in keeping her feet warm, even in winter, especially since she was too small to be running around on cold floors.  For toddlers, I would recommend using these with shoes.  Thin as they are, they keep a low profile under the shoes.

The socks don't quite match the picture, but I was really just looking for socks in quantity that would fit my baby and not fall off, so I wasn't really concerned with whether or not they matched.  In fact, I like the colors I got instead better, a series of pink, purple, and aqua green mixed with white in stripes and solids.  Very similar to the patterns shown, just more pastel.