The report which is yet to be verified, suggests Daesh militants have murdered at least 38 babies with Down's syndrome and other disabilities.
A spokesperson for Iraqi activist group, Mosul Eye, says a Sharia law judge issued an "oral fatwa" (the Islamic terrorist' term for a religious decree), authorizing its militant members to "kill new-born babies with Down's syndrome and congenital deformities and disabled children."
The oral fatwa is believed to have come from an Islamic State Saudi Sharia judge called Abu Said Aljazrawi.
Mosul Eye said it monitored the deaths of babies with Down's syndrome and found they were children of foreign fighters. The children were aged between one week and three months, and were killed by lethal injection or suffocated.
The deaths are believed to have taken place in Syria and the Iraqi city of Mosul.
"As if it is not enough for ISIL [Daesh] to kill men, women and the elderly, and now, they kill children," said a spokesperson for Mosul Eye.
If the reports are true, Daesh has copied a Nazi ruling to murder disabled children it believed to be a "burden on the state".