Wild One! Great 1st birthday gift idea for 1 year old baby boy / baby girl. One year old son / daughter shirts. Cute little kids Tee. Premium quality, short sleeved t-shirt. preshrunk 100% combed-cotton knit, machine washable. Available in a wide variety of colors and sizes: Infant sizes: 6 - 24 Months. Choose the size and color options from the drop-down list. Machine washable. The best gift ideas for kids birthdays, special occasions, holidays, baby showers & big brother, big sisters presents.