The following information is from NSPCC website:

Physical neglect
Failing to provide for a child's basic needs such as food, clothing or shelter. Failing to adequately supervise a child,or provide for their safety.

Educational neglect
Failing to ensure a child receives an education.

Emotional neglect
Failing to meet a child's needs for nurture and stimulation, perhaps by ignoring, humiliating, intimidating or isolating them. It's often the most difficult to prove.

Medical neglect
Failing to provide appropriate health care, including dental care and refusal of care or ignoring medical recommendations.

Neglect happens when parents or carers can't or won't meet a child's needs. Sometimes this is because they don't have the skills or support needed, and sometimes it's due to other problems such as mental health issues, drug and alcohol problems or poverty.

Although professionals may be worried about a child, it's not always easy to identify neglect. There's often no single sign that a child or family need help. So, professionals look for a pattern of ongoing neglect before they step in.