Ask an Immigration Solicitor. Get an Answer ASAP.
Good afternoon, if you are living in Turkey then you would not be able to claim child benefit for your child as department for pensions and work do not have an agreement with Turkey.
If the child was living in U.K. or EEA country then they would be eligible.
If you are moving back to the U.K. and unemployed you can make a claim online universal Credit and update them of your status as mentioned.