All clothing for baby one mother prepared for unborn child (6)

I believe the answer is:

embryo

'unborn child' is the definition.
(an embryo develops into a foetus)

I cannot understand how the remainder of the clue works.

(Other definitions for embryo that I've seen before include "new development" , "Unborn offspring in the process of development" , "Developing baby in the womb" , "Rudimentary state" , "My robe (anag)" .)

I've seen this clue in The Guardian.

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