"I purchased this shirt for my son to wear for his first birthday. It coordinates with the airplanes party supply theme perfectly! I purchased the smallest size available (18M) and it JUST fit my 1 year old, who is 19 lbs. 12.5 oz. and 30 1/4" long. Long and skinny kid - and the shirt just fit. After washing, it was even smaller. Keep this in mind when ordering!!!"