Abstract: The infant undergarment includes a rear panel extending down from a neck curve and between lateral seams. A lower flap defines a lower portion of the rear panel which has lateral edges defined by leg curves giving the lower flap an hourglass form. A lower edge of the lower flap can be rotated up between legs of an infant and fastened back to other portions of the infant undergarment. A right front flap and left front flap extend from lateral seams of the rear panel to lateral edges of the front flaps which are adjacent to each other. Front fasteners adjacent these lateral edges allow for removable attachment of these lateral edges of the right front flap and left front flap to each other. The corner fasteners and front fasteners utilize complemental fasteners which can be removably attached from each other for convenient removal and replacement of the infant undergarment.