The sick 'handbook', called Sister's Role in Jihad, recommends showing children jihadi websites, reading tales of jihad at bedtime, and encourages sports such as darts to improve their aim.

It explains that women should start training children 'while they are babies' as waiting until they are toddlers 'may be too late', adding: 'Don't underestimate the lasting effect of what those little ears and eyes take in during the first few years of life!'

The book was highlighted by the U.S-based Middle East Media Research Institute (MEMRI) ahead of a new report condemning how children are being indoctrinated into radical Islam.

Steven Stalinsky, executive director of MEMRI, said: 'As we move into 2015, Al-Qaeda and its affiliates, ISIS, and other jihadi groups worldwide continue to invest a lot of effort in indoctrination of the next generation of fighters. 

'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.'

Other advice from the book includes encouraging children to play with toy guns, while explaining that if you own a real gun, it must be kept 'totally out of young children's reach'.

The original authors of the textbook are unknown, as it is usually posted on file-sharing site anonymously, but it is thought to be used by ISIS and other terror groups. 

The book also helped inspired British extremist Runa Khan who was jailed for five years for posting images of her six children online dressed in jihadi uniforms, and advising an undercover policeman of ways to get into Syria.

The guide recommends making the training 'fun' for youngsters, though stresses that 'fun does not mean music and dancing, as is portrayed by Western children's TV.'

Instead, youngsters should be banned from watching all TV as 'it mostly teaches shamelessness, anarchy, and random violence'.

Children should take part in sports such as darts to improve their aim, skiing to improve their fitness, and camping to teach them to survive outdoors.

They should practice target-shooting with toy guns to help direct their anger, though parents should 'make it very clear who their target should be, and who their target should not be'.

(dailymail.co.uk)