Lightly weighted to mimic your hug and give your baby feelings of security and comfort to help fall asleep faster and stay asleep longer. Eases the transition from the swaddle. Decreases irritability while promoting self-soothing. Gentle weight increases serotonin and melatonin while decreasing cortisol. Enhances the quality of sleep to improve rest and development. 100% natural, soft cotton for temperature regulation. Inner beads are food-grade, safe and non-toxic.