MULTI-SIZE OPTIONS FOR YOUR GROWING BABY: Most parents want to ensure their baby has enough room to grow. That's why we offer four sizes for babies aged 0-24 months: 2-5 months / 6-12 months / 13-18 months / 19-24 months. Please check the size chart before purchasing to select the perfect fit for your little one. PREMIUM FLANNEL MATERIAL: Made from soft flannel with a napped finish on both sides, this baby sleep sack is highly absorbent and breathable. The cozy feel keeps your baby warm and comfortable all winter long, making it ideal for fall and winter use and protecting them from the cold. Are you ready to wrap your little one in this adorable baby sleep sack? CREATIVE DESIGN: Features a zipper closure and a 3D hood design with a double zipper that goes all the way to the back for easy diaper changes. Two small ears are sewn on either side of the hood, resembling a truly lovable animal. The particularly cute and chic edge finish on the cuff protects your baby's skin from fraying. Every detail is designed with your baby in mind, giving them the freedom to grow. WASHING INSTRUCTIONS: Easy to wash, whether by hand or machine. The flannel material remains soft after multiple washes. Ideally, the water temperature should be below 40 degrees Celsius in the washing machine to keep the flannel as soft and comfortable as possible. It's best to wash before wearing, as baby's skin is delicate. IDEAL BABY GIFT: This baby animal sleep sack is truly eye-catching! The MICHLEY baby sleep sack is not only suitable for daily wear but also perfect for many festivals, such as Halloween, Christmas, and Cosplay Parties. Invite your friends to join your baby's animal-themed party and bring lots of fun to your little one. This is the best gift for your baby – you should get one for your little one! The team is your forever loyal partner.