A hip positioning assembly (82, 220, 230) for an infant, comprising: a hip positioning device that comprises a flexible base having a pair of opposed, outwardly extending end portions dimensioned for supporting thighs (65, 72) of an infant at an acute angle (β) greater than zero relative to a dorsal plane of the infant, with knees (68, 75) of the infant in a flexed position, and a downwardly extending, generally central portion adapted for positioning between the infant thighs and dimensioned for retaining the infant thighs in an abducted position; characterized in that the end portions and the central portion are made of a non-porous material; the end portions define a first width (c) of the flexible base, and the central portion defines a second width (d) of the flexible base, and the first width is greater than the second width; the hip positioning device has a thickness (f); and in that it comprises a pouch-insert that is configured to house the hip positioning device; the pouch-insert is made of mesh fabric and includes an opening that permits insertion of the hip positioning device therein; and the pouch-insert includes a base portion with outwardly extending end portions that receive the end portions of the hip positioning device, and a downwardly extending central portion that receives the central portion of the hip positioning device, and the central portion of the pouch-insert has a height (h) greater than a height (b) of the central portion of the hip positioning device; and a cover that is configured to house the pouch-insert, the cover including a securing device that provides releasable attachment to the infant.. a hip positioning device that comprises a flexible base having a pair of opposed, outwardly extending end portions dimensioned for supporting thighs (65, 72) of an infant at an acute angle (β) greater than zero relative to a dorsal plane of the infant, with knees (68, 75) of the infant in a flexed position, and a downwardly extending, generally central portion adapted for positioning between the infant thighs and dimensioned for retaining the infant thighs in an abducted position; characterized in that the end portions and the central portion are made of a non-porous material; the end portions define a first width (c) of the flexible base, and the central portion defines a second width (d) of the flexible base, and the first width is greater than the second width; the hip positioning device has a thickness (f); a pouch-insert that is configured to house the hip positioning device; the pouch-insert is made of mesh fabric and includes an opening that permits insertion of the hip positioning device therein; and the pouch-insert includes a base portion with outwardly extending end portions that receive the end portions of the hip positioning device, and a downwardly extending central portion that receives the central portion of the hip positioning device, and the central portion of the pouch-insert has a height (h) greater than a height (b) of the central portion of the hip positioning device; and a cover that is configured to house the pouch-insert, the cover including a securing device that provides releasable attachment to the infant..