Fortunately my girl seems pretty lax about letting me touch her babies. I had to handle them on the second day (for other reasons, not because of sexing), and she could've cared less. I did find a dead baby(still born?) on the first day, and she didn't even try to eat the baby. Just left it there in the cage (one of my snakes had a nice snack).
The reason I want to sex them within the first week is because I need pinkies to feed my baby snake. I did notice that the genitals of some of the babies were larger than others. But I can't tell if that's because they're males or because they're large babies.