Bajo (a).
Bajito is a bit insulting.
I would that Sr X 'is not very tall' to avoid offence. The Spanish are still a proud nation.
If their are short: bajo or bajito for the man, baja or bajita the woman. It's more normal to say bajito and bajita than bajo and baja.
If their are tall: alto for the man, alta for the woman.
I don`t think the Spanish call people vertically challenged. It would take far too many words.
Bajo/baja.
And...it's espa?ol castellan, or just castellano.
if a man or woman is short what would be the word to call them if they were short. and vise versa if they were tall. please en espanol castilla