If the casualty is injured, put it into a small container with padding for support ie old towelling, to limit its mobility and prevent causing further injury.
Always provide a small container of water – never milk.
Give the casualty somewhere to hide, i.e. old towelling etc.
If the animal feels cold, put in a hot-water bottle wrapped in towelling etc.
Keep the animal in a warm, quiet room away from pets and children.
Never use flea treatments especially on hedgehogs.
Infant mammals are unable to retain body heat, so it is important to provide artificial heat, i.e. a covered hot water bottle.
Offer the orphan cooled boiled water from a dropper taking great care not to overfeed or feed too quickly.
Never give milk as mammals, except cows and humans, are unable to digest the lactose.