Littogoose 1.0 TOG Long Sleeve Sleep Sack, Sleep Sack with Arms is the perfect solution for keeping your baby warm and cozy during cooler nights. Made from soft, breathable fabric, it's ideal for autumn and spring. The 1.0 TOG rating provides just the right amount of warmth to keep your baby comfortable throughout the night without overheating. This baby sleep sack is available in sizes ranging from newborn to 18-36 months, including sleep sack 3-6 months, sleep sack 6-12 months, and sleep sack 6-18 months. Designed with sleep sack with sleeves, it features a convenient full-length zipper for easy diaper changes and an adjustable design to ensure a snug fit for babies from 0-6 months to 18-24 months. The long sleeve sleep sack ensures warmth for cooler nights, making it perfect for baby sleeping bags and wearable blanket baby. It's also machine washable and designed to be durable, staying soft and fresh after every wash. With Littogoose, your baby will enjoy a safe, comfortable sleep in a baby sleeping sack no matter the season, whether they are a newborn or a sleep sack 18-36 months toddler.