Children are being made wards of court or temporarily put into foster care under an interim care order.
At least 32 children in London have been made the subject of family court orders this year because of fears of radicalisation, police have revealed.
Scotland Yard said judges have considered cases involving 12 families.
In some cases, courts heard children had relatives that police believed wanted to travel to areas controlled by militant group Islamic State.
The children were made wards of court or temporarily put into foster care under an interim care order.
Of the 32 children across the London area, there were 22 wards of court issued and 10 interim care orders.
This figure is expected to rise as the powers are used more often.
Assistant Commissioner Mark Rowley, the country's most senior counter-terrorism officer, said in some instances the children were "almost babes in arms", with ages ranging from two or three up to 16 or 17.
Mr Rowley said: "The last thing we want is children going to a war zone with a terrorist ideology around them."
Electronic monitoring tags have been fitted to adult family members because of fears they could take children to areas controlled by IS
Adult members of two families were ordered by a judge on Tuesday to be immediately fitted with electronic monitoring tags because of fears they could take children to areas controlled by the Islamic State (IS) militant group.
Mr Rowley disclosed that counter-terrorism officers were now arresting suspects at a rate of more than one a day.
It was also revealed that the number of passports temporarily seized by police from individuals suspected of travelling for terrorist purposes has reached double figures.
The confiscation power was introduced earlier this year.
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