When a parent doesn't know that their kid is in danger
My mom works at a concession stand, and there was an incident where a child got hit on the head with a baseball. The child's head started bleeding, and the child's mom was asking for ice for their kid. My mom told them to call 911, and the child's mom thought it wasn't as big of a deal. 10 minutes after this, the child started vomiting, and 911 was called.
Normally, they would ask for ice for minor injuries, but this looked very serious. This is another example of child neglect, as this could have been fatal. I'm not sure why people don't do what is best for their kids' health.