These 6 - 12 mo. sized Robeez are perfect for my 12 mo granddaughter, who is 20 lbs and 30 inches tall. They go on quite easily and stay on, which is an absolute PLUS.  The elasticized bands (rather than velcro fasteners) make it just a tad more challenging but once on, they stay on! She has more room in the toe area as they do run large.  These are perfect to keep her feet protected, yet, allow her to "cruise" easily around the rooms.  They also allow her to get up on her tippey-toes, which she enjoys, while dancing to her musical and educational toys. I definitely recommend them.