An infant sleeping garment has a main body formed from a front surface joined to a rear surface by overlapping material from the front and rear surfaces. The overlapping material provide and intermediate area between the front and rear surfaces of the garment. The width of the intermediate area is selectively adjustable to vary the volume of the main body of the garment to accommodate the same infant as he or she grows, or to accommodate different infants of different sizes in the same adjustable garment.