Trazzle this leaflet explains it.
"If your child gets Disability Living Allowance and is under 16, it will usually stop after they have been in hospital for more than 12 weeks. If your child goes into or comes out of hospital, you must tell the Disability and Carers Service straight away"
The trouble is, that they link the periods of time spent in hospital if there are less than 29 days between them. For example:
Child A: Admitted for surgery 01/04/2013, in for 3 days. 'Count' of 3 would be recorded until 03/05/13, when it would 'reset' to 0. If he was then readmitted on 10/05/2013, in for 13 days, his 'count' would be 13 until 21/06/2013, when it reset to 0.
Child B is admitted for the same surgery, on the same day. So, he gets his '3' count until 03/05/13 when it would reset to 0. Unfortunately, he has an infection so is readmitted on 01/05/13, just 27 days after his last day in hospital. He stays 13 days, but his 'count' is added to the previous count taking his total day count to 16.
Now, that's no big deal, unless you have a child with a chronic condition with a short treatment cycle (ie. cancer).
Take a 6 days on, 2 weeks off, cycle:
01/04/13-07/04/13: Chemo
07/04/13-21/04/13: Off chemo (but still popping in for bloods, infections blah blah)
22/04/13-28/04/13: Chemo
Those 6 days are added to the previous 6 days and make 12 days.
3 days later, low platelets, whatever - overnight in hospital
13 days
2 days after that - fever while neutropenic - 48 hrs ivabx
15 days
9 days later - 6 day chemo
21 days...
Very soon you can ramp up 85 days in hospital, because they've linked the attendances due to a rule that there has to be a break of 29 days to count as 'separate' attendances.