Anti-startle: Specially designed for newborns over 2 months old, the elastic cotton material simulates the feeling of uterine wrapping, effectively suppressing the startle reflex. Fits the body shape of the chest 41-52 cm and gently binds the limbs, reducing the awakening of unconscious movements during sleep, helping your baby sleep well all night.Double belly protection for warmth: The abdomen is thickened with a cotton covering, and the high-waist design covers the top of the navel to block cold air 360°. Even if the baby kicks the quilt, it can continue to keep the abdomen warm, suitable for use in air-conditioned rooms or when the season changes, reducing the risk of cold.Four-dimensional elastic adjustment system: the shoulders and waist are combined with Velcro elastic bands, which can be flexibly adjusted according to the baby's growth. The elasticated closure prevents over-tightening and provides a comfortable wrap.Skin-friendly material: smooth to the touch like amniotic fluid, strong breathability. It does not sweat after wearing it for a long time, and cares for the delicate skin of newborns.Convenient: The bottom is fully open, so you can quickly change diapers without unwrapping the whole package, which is convenient to use.