An innovative sleeping suit for infants, configured to provide warmth, a contained environment, and positive proprioceptive input, and thereby reduce neurological reflexive twitching or habitual waking patterns prevalent when infants are placed on their backs for sleeping and are not swaddled. The weighting in the suit is believed to reduce the neurological reflexive twitching and provides a swaddling effect to infants helping them to fall asleep and remain sleeping when on their backs. At least a portion of an anterior portion of the suit includes the weighting. The weighting may be accomplished by varying the thickness of the materials and/or quantity of layers of materials used on the anterior portion of the suit. The weighting may be distributed uniformly throughout the suit, the anterior portion of the suit, or can be strategically placed at proprioceptive target points along the anterior portion of the suit.