A swaddling suit (100; 200) for swaddling an infant, including: (a) an upper portion for enclosing an infant's upper body, wherein the upper portion includes: I. a bodice portion for enclosing an infant's torso and both arms, and wherein the bodice portion is configured to retain the infant's arms in a hand-raised position such that the hands are maintained in position relative to the infant's face; and II. a position-restricting means to further maintain the hands in position relative to the face, wherein the position-restricting means includes a wing portion near the suit's (100; 200) shoulder line on each side of the bodice portion for receiving the infant's arms, and wherein each wing portion is configured to hug the infant's arm in an elbow-bent-and-hand-raised position and is configured to taper in towards the infant's body under the bent elbow thereby cupping the bent elbows such that the hands are retained in a position relative to the face and the infant is able to move their hands towards their mouth; and wherein each wing portion includes a wing tip, the wing tips being configured to receive the infant's raised hands such that their hands are retained at the uppermost portion of the wing portion; (b) a lower portion including a pouch for enclosing the infant's legs; and (c) an opening to allow insertion of an infant into the swaddling suit (100; 200) (100; 200), wherein the opening is closeable such that the swaddling suit (100; 200) is capable of being closed, the closed suit (100; 200) wrapping around the infant's body and limbs, thereby swaddling the infant therein, and wherein the swaddling suit (100; 200) restricts movement of the infant's limbs away from the body while allowing movement of the infant's hands towards the infant's mouth and maintaining the infant's hands in position relative to the infant's face, thereby facilitating non-nutritive sucking. (a) an upper portion for enclosing an infant's upper body, wherein the upper portion includes: I. a bodice portion for enclosing an infant's torso and both arms, and wherein the bodice portion is configured to retain the infant's arms in a hand-raised position such that the hands are maintained in position relative to the infant's face; and II. a position-restricting means to further maintain the hands in position relative to the face, wherein the position-restricting means includes a wing portion near the suit's (100; 200) shoulder line on each side of the bodice portion for receiving the infant's arms, and wherein each wing portion is configured to hug the infant's arm in an elbow-bent-and-hand-raised position and is configured to taper in towards the infant's body under the bent elbow thereby cupping the bent elbows such that the hands are retained in a position relative to the face and the infant is able to move their hands towards their mouth; and wherein each wing portion includes a wing tip, the wing tips being configured to receive the infant's raised hands such that their hands are retained at the uppermost portion of the wing portion; I. a bodice portion for enclosing an infant's torso and both arms, and wherein the bodice portion is configured to retain the infant's arms in a hand-raised position such that the hands are maintained in position relative to the infant's face; and II. a position-restricting means to further maintain the hands in position relative to the face, wherein the position-restricting means includes a wing portion near the suit's (100; 200) shoulder line on each side of the bodice portion for receiving the infant's arms, and wherein each wing portion is configured to hug the infant's arm in an elbow-bent-and-hand-raised position and is configured to taper in towards the infant's body under the bent elbow thereby cupping the bent elbows such that the hands are retained in a position relative to the face and the infant is able to move their hands towards their mouth; and wherein each wing portion includes a wing tip, the wing tips being configured to receive the infant's raised hands such that their hands are retained at the uppermost portion of the wing portion; (b) a lower portion including a pouch for enclosing the infant's legs; and (c) an opening to allow insertion of an infant into the swaddling suit (100; 200) (100; 200), wherein the opening is closeable such that the swaddling suit (100; 200) is capable of being closed, the closed suit (100; 200) wrapping around the infant's body and limbs, thereby swaddling the infant therein, and wherein the swaddling suit (100; 200) restricts movement of the infant's limbs away from the body while allowing movement of the infant's hands towards the infant's mouth and maintaining the infant's hands in position relative to the infant's face, thereby facilitating non-nutritive sucking.