Not A Doctor

Junior Quartet this morning.  Visited by one of the cellists who is also in grade 5 this year (and was in my ensemble last year - the chatterbox).  This happened as we were heading down the stairs at the end of rehearsal.

Cello: No way!  Miss M, C just moved up to a three-quarter size cello!
C [obviously very pleased with this]: Yep!  It's cos my hands are bigger.
Me: Let's see.  [She holds up her hands].  Wow, your fingers are really long.  My hands are really small...
C:  How big are yours, let me see! [She tries to match up her right hand with my right, then I convince her to hold up her left].  No way!  Yours are tiny!
Me: Ah... yes. [Viola tries out as well, same result]
Cello: Well, Ms T said, my arm has grown... but...well... she's not a doctor...  So she wants to wait until my hand has grown as well, otherwise I might go flop [with accompanying arm-falling-down-the-cello action] and end up at the wrong end.