TILLYOU Sleep Sack - Cotton Wearable Blanket Baby 2-Pack Set, Fits Infant Newborn Ages 0-6 Months, Gray Crown - Crowns Small

I do not have a favorite brand yet, but the sleep sack is great! It helps not having to use several fabrics to swaddle, or layer clothing. It is comfortable for baby and can use sleep sacks for years, with ones with the swaddle mechanism to arms free!