If you find an injured or orphaned joey it is important to follow the below recommendations to give the joey best chance of survival :
Joeys can live in the right conditions for up to 72hr in their deceased mothers pouch so if you see a dead roo on the side of the road, if safe, please stop and check the pouch.
Pouches are deep and so you may have to have a good feel around. If you discover a joey and it's not attached to the teat you will need to remove carefully, place hand on the base of the tail closest to the body to gently lift the joey from the pouch, this is the safest way to handle the joey.
If the joey is still attached to the teat it is safest to cut the teat from the deceased roo, and leave the teat in the joeys mouth, the joey will release the teat in time, by trying to remove the teat with force you can damage the joeys mouth.
Joeys as small as about the palm of your hand can be viable for rehabilitation provided they are kept warm and are placed with a registered carer or vet quickly.
Place joey in a warm quite place.
Keep handling to a minimum. Stress can kill wildlife and they do not understand that your efforts are well intentioned so excessive handling, stroking and the curiosity of children will own make their situation worse. Kangaoos in particular can suffer from capture myopathy or stress myopathy that can prove fatal. If travelling turn off the radio and keep noise to a minimum, wrap joey in a jumper, coat, blanket or towel depending on the size of the joey. This will go some way to replicating the security of being in their mother's pouch.
Do not try and feed joey.
Joeys require a special milk formula and different strengths of formula for each stage of growth.
Get the joey to a vet or registered carer ASAP
The joeys best chance of survival is to get it to a registered carer, who will have the knowledge and correct resources to feed and care for the joey. Most vets will have the means to contact the carers.