Personalized I'm One 1st Birthday Watermelon Baby Bodysuit. Cute watermelon bday design for the 1 year old says I'm One on this 1st Birthday Baby Bodysuit - Heather and Navy. 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.