This is a nice quality knit dress. Baby sizes run towards the smaller size listed and tags show smaller size (Example 6-12 is tagged 6 months). Avery is approx. 37 lbs. 42" in most 4s wearing the 4T with a great fit. Tag say 6 Months but sticker says 6-12, 12 months but sticker says 12-18 and 18 months but sticker says 18-24 months.