The Hudson Baby Unisex Baby Cotton Long-Sleeve Wearable Sleeping Bag is designed for infants aged 3-9 months. Made from 100% cotton, this sleep sack features long sleeves with mitted cuffs to keep your baby warm and cozy while preventing accidental scratches. It is optimal for everyday use, providing a safe sleep environment by replacing loose blankets in the crib. The soft and gentle fabric is comfortable against your baby's skin, ensuring a peaceful night's sleep without the risk of overheating.