95% Viscose, 5% Spandex Imported Safe and Comforty: Our baby swaddle are tested by professional testing institutes and comply with CPC standard for baby products. The swaddle blanket is 95% Viscose from Bamboo and 5% spandex, which is known for its softness, sustainability and friendly to baby's skin Care for Baby's Development: Loose hemlines be beneficial for hip development in babies by allowing for greater freedom of movement and flexibility in the hip joint. Aomloge swaddles for newborns pay more attention to the development of baby's bones, ligaments, and muscles in the hip, ensuring that they grow up with strong and healthy hips Relieving Parents' Stress: Baby's sleeping problems are really troubling to every parent. Swaddle sack can simulate a mother's embrace by wrapping a baby securely with only the head exposed to give your baby a sense of security and soothe them when they're fussy or upset High Quality Zippers: Our newborn swaddle features zips that have been rigorously tested over 10,000 times to ensure smooth operation. The 2-way zipper makes it easy to put on and take off, and the 20% extra length adds convenience for quick nappy changes Localised Fit Design: To design this transition swaddle, we have researched the majority of American babies' height, weight, shoulder width, chest circumference and other various parameters, and also referred to the official data of the WTO organization. This baby swaddle is a perfect choice for babies 0-15 months with 4 sizes