Baby pair of maths terms (6)

I believe the answer is:

cosset

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'baby pair of maths terms' is the definition.
'cosset' can be an answer for 'baby' (synonyms). I'm not sure about the 'pair of maths terms' bit.

'baby pair' is the wordplay.
'baby' becomes 'cos' (I can't explain this - if you can you should believe this answer much more).
'pair' becomes 'set' (I've seen this in another clue).
'cos'+'set'='COSSET'

Can you help me to learn more?

(Other definitions for cosset that I've seen before include "Overindulge" , "Protect overindulgently" , "lamb" , "Fondle" , "Indulge - pamper" .)

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

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