Personalized 4th Birthday Boys Police Car Policeman Baby Bodysuit. Cute 4 year old birthday Baby Bodysuit - White & Heather w/ Ears with police car and I'm four quote for a little boy turning 4 years old. 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.