The concept of height, as in 5'7, can be produced by the number 5 being signed higher than the normal fingerspelling position and the 7 would be done a bit further to the right of (and perhaps a little bit higher than) where you did the number 5.
You would not need a separate sign for "feet" nor "inches" in that situation because the meaning is obvious from the context and from the location (up near the head) in which you are doing the numbers.
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Notes: