
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.

Soft Fleece Swaddle Blanket For Newborn Baby Boys And Girls - XMWEALTHY Stroller Wrap In Dark Blue
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Baby Floral Fitted Crib Sheet For Boy And Girl Toddler Bed Mattresses Fits Standard Crib Mattress 28X52 (Pink Mint Floral)
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UOMNY Soft 100% Cotton Fitted Crib Sheet For Standard Crib And Toddler Mattresses - Safari Animal Jungle Theme Nursery Bedding For Boys And Girls - 1 Pack Toddler Sheet
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Pink Soft Plush Swaddle Blankets For Newborn Baby Girls - Cute Nursery Items By XMWEALTHY
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Kids Kitchen Step Stool with Safety Rail - Toddler Learning Tower for Kitchen Counter, Kitchen Helper Stool for Toddlers 18+ Months - Solid Wood
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Extra Large Baby Playard | Toddler Safety Activity Center With Anti-Slip Base & Tear-Resistant Material | 79”×70” Grey TODALE Playpen
39 Review

Pampers diapers New Baby Dry 2, 4-8 kg, 94 pcs., white
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Large Toy Box Chest For Boys & Girls - 24.5"X13" X16", Flip-Top Lid, Divider, Collapsible Storage Bins For Nursery, Playroom, Closet & Living Room | Homyfort (Black)
39 Review