If you are worried about a child and believe that child is in immediate danger, you must contact the police on 999.
For other concerns, please follow the links below to report your concerns about a child. You do not need to know for certain that the child is being abused. If you have concerns, you should report them to the relevant Children's Service department. You can contact them and ask them, on the basis of the information you are giving, whether they advise that you make a formal referral. It is very helpful for them if you have as much information as possible to help them identify which child you are talking about: first and last name, date-of-birth if you have it, which school they go to, and their address if possible.
The phone number to call if you are worried about a child in Brighton and Hove is 01273 290 400, or 01273 335 905 for out-of-hours calls. The website giving more information about how to refer to concerns and what help might be offered is available here
The phone number to call if you are worried about a child in West Sussex is 01403 229 900, or 033 022 26664 for out-of-hours calls. The website giving more information about how to refer to concerns and what help might be offered is here
The phone number to call if you are worried about a child in East Sussex is 01323 464 222, or 01273 335 906 or 01273 335 905 for out-of-hours calls. The website giving more information about how to refer concerns and what help might be offered is here