G4S HMP Oakwood

What are G4S playing at? How long were they taking toddlers fingerprints for before they realised that they had 'made a mistake'? I agree with one of the posts on here when someone said that the children's mothers would probably have let, maybe reluctantly, but allowed the G4S prison officers to take their fingerprints just in case they were refused entry to the visit. What's the MOJ said about it all? Or am I asking a ludicrous question? If my children were subjected it, I'd be going for a pay-out of some sort.