I bought the 6 to 12 month size for my 4 month old. It is big but works just fine. He will be able to use it for a long time. We bought this as a transition from a swaddle blanket but now that his arms aren't swaddled, he wakes up more in the night. :( Our house is cold in the winter and when I feed him at night, his hands are still cold but overall I think he is warmer with the sleep sack.
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