Personalized 3rd Birthday Monster Truck Baby Bodysuit. 3rd Birthday Monster Truck Baby Bodysuit - Heather and Navy for boys turning three years old. Colorful confetti and number 3 add a party feel to this bday design. Our unisex one piece baby bodysuit make great gift for newborns, babies, infants, baby showers and expectant moms. An ideal gift for any new parent who will want one in every color.