Navy Blue snowpants are size 5 yr but have adjustable straps and likely be fine on a 4 or 6 year old depending on their height. The Navy blue boots are great quality and are size 12. If interested in bundling I can give a great deal on similar sized items all in Navy Blue as well. I also have like new ultra lightweight springtime rain boots (crocs) size 13 and excellent quality Hanna Andersson spring jacket and vest in in size 5 yr or 110. As well as a Ralph Lauren Polo snow jacket very warm and stylish.