Big boy's three-year-old stats

Frank had his three-year-old doctor's appointment yesterday, and he is still a tall, skinny boy.  We already knew that because none of his pants fit.  He is 38.25" tall (71st percentile) and 32 pounds (54th percentile).  During the development part of the appointment, his doctor asked me if Frank knows his full name, and I said yes, and (trying to impress her with my super smart boy), I asked Frank, "what is your last name?"  He said "banana" and cracked up.  I asked him about five more times, and he kept repeating "banana."  This little boy knows how to say and spell his full name, but he was not going to do it for the doctor.  She told me she would take my word for it.  Ha!  What a little stinker.