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Explanation: I couldn't find "Durchformung" anywhere I looked, whether on the net or in my dictionaries, until I got the old Collins out.
It says: durchformen = to work out (down) to the last detail.
Unfortunately you didn't give much context, but the term "development" came to my mind with regards to the aforementioned Foetus.
I checked this with my Thesaurus. It came up with:
Ontogenesis = The process of an individual organism growing organically; a purely biological unfolding of events involved in an organism changing gradually from a simple to a more complex level.
As I said, I'm not sure about the context, but I think that "ontogenetic development" or "ontogenesis" might be what you're looking for.