How are newborn babies identified as belonging to their mother so that babies are not accidentally mixed up and leave hospital with the wrong parent(s)?

Blood transfusion

How are newborn babies identified as belonging to their mother so that babies
are not accidentally mixed up and leave hospital with the wrong parent(s)?

If a patient needs a blood transfusion, what checking processes are in place
to ensure they receive the correct blood type?

How are patients encouraged to speak up if they do not understand why
the doctor is doing something to them that they were not expecting?