A large number of children injured by incendiary bombs were taken to the Syrian-American Medical Society hospital in Hama, president of the aid group Dr. Zaher Sahloul said.
One of the shocking photographs shows a young boy sat upright on a hospital bed with horrific burns. His hair has been singed and his clothes have been cut away from his body.
Dr Sahloul said on Twitter: 'This is not a victim of American Napalm in Vietnam but a Syrian child victim of Assad's Napalm in Hama.'
The Britain-based Syrian Observatory for Human Rights confirmed a series of airstrikes since early on Thursday had killed at least 25 civilians, including six children, in northern Hama province.