As always, I checked the manufacturer's website for its size-chart before buying these footed pants, since Amazon's universal baby-size chart is often inaccurate.  Well, as it turns out, Kushies' own sizing info is a bit off as well.  I bought 2 packs of these pants in size "6 months" (3-6 months) for my 4-month-old daughter, who falls well within the 12-16 lbs and 21-24 inches ranges for this size.  However, these pants are too big for her; and even if I wash them (which I always do before 1st wear), they still won't shrink enough to fit her right now.  I opted to keep them rather than returning/exchanging, since she'll hopefully grow into them in a few weeks.  But it's kind of a bummer to have to wait for her to wear these pants, since they're pretty cute!  The material is also nice & soft; and the non-slip "dots" at the bottom of the footies will allow her to use her feet to roll over and move her body across the floor without losing traction.  I can see these becoming her favorite Fall/Winter play-pants ... once she can fit into them!