Plumpness that disappears during adolescence (5,3)

I believe the answer is:

puppy fat

(Other definitions for puppy fat that I've seen before include "Adipose tissue disappearing in adolescence" , "Early chubbiness" , "Excess weight during youth" , "Childhood plumpness" , "Childhood tubbiness, often lost by maturity" .)

I've seen this clue in the Sydney Morning Herald.

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