I bought this sack in 6-12 mo for my 4 mo old daughter for the warmer months and I am very pleased.  She is tall (approx 26 in) and the bag seems to be the right size and should fit her hopefully through the spring and summer.  We got the kiwi color due to it being cheaper than the pink (about 10 less) and find the color to be pretty for a girl.  The price has since gone up.  We have 8 swaddle design sacks in various weights and sizes (I buy them ahead of time when the price drops) and like them so much better than the Halo sacks.  The zippers are larger on these and easier to zip than on the Halos.  Also, the fabric does not stretch out and gap up around my daughter's face.  The weight of this sack is just like covering her with a swaddle design blanket so not too heavy and she seems comfortable with a pair of gymboree shortie pjs underneath.