20 years old!!! Another example of why some gilrs should wait before having children at such a young age with some idiot that "loves" her but can't provide jack schnitt!
I doubt that age has anything to do with it. I would bet that they were either drunk and high or one of them physically abused the child to the point of death. Even most ten year olds wouldn't intentionally harm a baby. There is more to this story. The fact that she has 3 stair-steps and is pregnant again at only 20 years old, and not married (or married or not) probably says more about her maturity level and intelligence or lack of, than her only being 20 does.