Our weighted sleep sack is designed to help baby feel calm, fall asleep faster and stay asleep longer. The gentle weight naturally reduces stress and increases relaxation through deep-pressure stimulation to give baby feelings of security and comfort. Gentle weight is located on front (or top) of weighted sack only. Our products are safe for babies who are rolling and do not restrict movement. Baby can safely roll, sit or stand. Product fits true-to-size, we do not recommend sizing above baby's current weight