According to the Joint United Nations Program. In the world there are 2,5 million children living with HIV/AIDS. HIV and AIDS in children. Is quite a tricky question especially because not always a mum suspect her baby can have HIV until he or her develop symptoms. They can be different depending on the age of the child and on each individual, but usually those are quite common symptoms:. Failure to thrive, to gain weight and to grow according to standard growth charts. Treatments for HIV/AIDS in children.