They didn’t kill their child. But they were very ignorant.
Willfull neglect of the child’s condition killed her, and the neglectful parties were the parents. Ergo, the parents killed her.
You are wrong, they didn’t even do what a child could do and that was to dial 911. Their medical neglect of this child did indeed kill her.
Sorry you but are wrong. They killed her with neglect. If a parent doesn’t feed a child and it dies from starvation, then the parent killed the child. Neglect kills.