Problem:

Let's say there's a girl who carries a few masculine traits not normal in most girls, such as a high level of testosterone; we know there are countless reasons why something like this could happen, but could that girl have actually been concieved as a boy but modified before birth to become almost fully female, with only slight traces of male traits left?

Question: Is that possible through any sort of technology, or does biology even work that way?Please explain.

For instance, if a male baby was injected with high amounts of female hormones before his birth, or really, anything else that could alter his gender, in any case could he start morphing into a girl, even if not fully?