hi there
my son is 13 now and i recive domicillary allowance,
if i remember rightly we recived it from the date of the appointment with the then health board, not from date of diagnosis, as my son was born with down syndrome, i dont know if it is still the same but all kids are not registered as disabled in this country untill they are 3, no matter what is wrong with them, how irish,
i do know that the hse likes to take its time, id say you will wait about 2 months but it will be backdated to the day of that appointment,
best of luck,
netty