No, that's not how it works.
Your photo will be reduced to a single numerical fingerprint. That fingerprint will be compared to a list of fingerprints for known images without any context about your image. This fingerprint isn't a picture of your child bathing, and it's definitely not an image or understanding of genitalia. It t's just a number like 8BA62546-1258-4E90-9096-48EE7365ECAE. Since your photo is not on the list, nothing will happen.
On the other hand (and of course you wouldn't do this, I'm just trying to explain the mechanics here), if you sold that image online to a lot of people and it became a well known image of child pornography, the FBI would eventually add the image to their database. Apple would end up building a fingerprint of the FBI's copy of that image. If that fingerprint still matched your image, it would be flagged. Apple/LEO would be able to look at their copy of the image matching that fingerprint because they acquired the image through another mechanism. In this case, though, some other mechanism got the photo from your computer or phone into the cloud.