A guide for jihadi mothers on how to raise children to become terrorists has surfaced online, the US-based Middle East Media Research Institute (MEMRI) reported.
The handbook titled "Sister's Role in Jihad" recommends showing children jihadi websites, reading jihad tales before bed, practicing sports that require good hand-eye coordination, like darts, and going on camping trips to teach the children how to survive outdoors.
Women are expected to start training children "while they are babies" as waiting longer than that "may be too late." The guide adds: 'Don't underestimate the lasting effect of what those little ears and eyes take in during the first few years of life!'
The guide's original authors remain unknown, as the text is usually posted on file-sharing sites anonymously. However, the handbook is believed to be used regularly by Islamic State and other terrorist groups.
Other advice includes encouraging children to play and practice target-shooting with toy guns and making the training "fun" for youths, though the text stresses, "fun does not mean music and dancing, as is portrayed by Western children's TV."
Parents are also expected to ensure their children know how to differentiate between "who their target should be, and who their target should not be."
The guide is known to have at least one definite follower - British extremist Runa Khan, who was convicted and jailed for five years for dressing her six children in jihadi uniforms and posting the images online.
MEMRI released the information of the guide ahead of an upcoming report condemning how children become indoctrinated into radical Islam.
"It is important for the West to understand that all these groups want the world to know that this indoctrination is taking place," MEMRI said in a statement.
"No matter what happens in Iraq and Syria in the near future, the next generation - the children of Baghdadi and grandchildren of bin Laden - have already been brainwashed to hate the West and to strive for jihad and martyrdom."
"They have been trained on the battlefield and know how to create bombs and suicide belts and to behead and crucify the innocent. This is something we must be prepared for and understand."
MEMRI researchers believe this guide, and others like it, is being used by ISIS fighters bringing up their children in the Middle East.
Indeed, Twitter accounts linked to ISIS regularly feature images of children holding weapons - like knives and machine guns. These pictures are often accompanied with the caption "Generation Caliphate" or "Ashbal," meaning lion cubs.