A swaddling suit for swaddling an infant, the swaddling suit comprising: an upper portion for enclosing an infant's upper body, wherein the upper portion comprises: a bodice portion for enclosing an infant's torso and one or both arms, and wherein the bodice portion is configured to retain the infant's arm in a hand-raised position such that the hand is maintained in position relative to the infant's face; a position-restricting means to further maintain the hand in position relative to the face such that the hand Is restricted to one or more positions near the face; wherein the position-restricting means includes a wing portion near the suit's shoulder line on each side of the bodice portion for receiving the infant's arm, and wherein each wing portion hugs the infant's arm in an elbow-bent-and- hand-raised position and tapers in towards the infant's body under the bent elbow thereby cupping the bent elbow such that the hand is retained in a position relative to the face and the infant is able to move the hand towards the mouth; wherein the wing portion is resilient to bias the infant's arm toward the body such that once in the elbow-bent- and-hand-raised position, the resilient wing portion further assists in maintaining the hand near the face; and an opening to allow insertion of an infant into the swaddling suit, wherein the opening is closable such that the swaddling suit is capable of being closed, the closed suit wrapping around the infant's body and limbs, thereby swaddling the infant therein, and wherein the swaddling suit restricts movement of the infant's limbs away from the body while allowing movement of the infant's hand towards the infant's mouth and maintaining the infant's hand in position relative to the infant's face, thereby facilitating non-nutritive sucking; the swaddling suit is caracterized in that the position restricting means include a tension pouch intermediate the wing portion and the bodice portion near the shoulder line, wherein the tension pouch biases the infant's arm toward the elbow-bent- and-hand-raised position such that the hand is retained in a position relative to the face and the infant is able to move the hand towards the mouth. an upper portion for enclosing an infant's upper body, wherein the upper portion comprises: a bodice portion for enclosing an infant's torso and one or both arms, and wherein the bodice portion is configured to retain the infant's arm in a hand-raised position such that the hand is maintained in position relative to the infant's face; a bodice portion for enclosing an infant's torso and one or both arms, and wherein the bodice portion is configured to retain the infant's arm in a hand-raised position such that the hand is maintained in position relative to the infant's face; a position-restricting means to further maintain the hand in position relative to the face such that the hand Is restricted to one or more positions near the face; wherein the position-restricting means includes a wing portion near the suit's shoulder line on each side of the bodice portion for receiving the infant's arm, and wherein each wing portion hugs the infant's arm in an elbow-bent-and- hand-raised position and tapers in towards the infant's body under the bent elbow thereby cupping the bent elbow such that the hand is retained in a position relative to the face and the infant is able to move the hand towards the mouth; wherein the wing portion is resilient to bias the infant's arm toward the body such that once in the elbow-bent- and-hand-raised position, the resilient wing portion further assists in maintaining the hand near the face; and an opening to allow insertion of an infant into the swaddling suit, wherein the opening is closable such that the swaddling suit is capable of being closed, the closed suit wrapping around the infant's body and limbs, thereby swaddling the infant therein, and wherein the swaddling suit restricts movement of the infant's limbs away from the body while allowing movement of the infant's hand towards the infant's mouth and maintaining the infant's hand in position relative to the infant's face, thereby facilitating non-nutritive sucking; the swaddling suit is caracterized in that the position restricting means include a tension pouch intermediate the wing portion and the bodice portion near the shoulder line, wherein the tension pouch biases the infant's arm toward the elbow-bent- and-hand-raised position such that the hand is retained in a position relative to the face and the infant is able to move the hand towards the mouth.