I watch his rallies and haven't heard him say ( he usually just says: VERY TALL ), 6'7". In what speech/rally did he give the numbers you claim he said?
I saw that number, too, in a Daily Mail previous article.
Recently. Within the last month
A HREF=https://www.yahoo.com/entertainment/trump-calls-6-9-barron-173654720.html>Barron Trump 6-9</A>