The most common and most likely answer to this crossword clue is the 13 letter word PRECONCEPTION
I've seen this crossword clue in Independent
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More clues leading to the result PRECONCEPTION
Buddy explains!
The straight part
We know that "Position assumed/when going to make a baby?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case position assumed/when going to make a baby? = preconception.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PRECONCEPTION mean?
PRECONCEPTION noun- An opinion formed before obtaining adequate evidence, especially as the result of bias or prejudice.
- A prejudice that prevents rational consideration of an issue.
- Preconceptional.