0-6 months https://dreamlandbabyco.com/products/dream-weighted-sleep-sack-color-grey-star?_pos=3&_psq=Stars&_ss=e&_v=1.0 Our patent-pending Dream Weighted Sleep Sack is designed to help your baby feel calm, fall asleep faster, and stay asleep longer. The sack features our exclusive CoverCalm® Technology, evenly distributed weight from your baby’s shoulders to toes to naturally reduce stress and give your baby the feeling of security and comfort - just like a hug. This sleep sack is a 1.0 TOG, perfect for 68-73°F or 21-23°C Gentle, evenly distributed weight to help your baby feel calm Encourages self-soothing for longer stretches of sleep Reversible neckline designed for tummy sleepers 100% natural soft cotton Tagless design to avoid irritation Two-way zipper for easy diaper changes Machine Washable