A - Thanks for the question. This one stumped me in class last night, for the first time in a while. It is good to be stumped. It makes me do my homework. Here is what I found in the Code of Canon Law:
Therefore, an adult who has shown an intention to be baptized, and not recanted that intent, can validly be baptized while unconscious.
§2. An adult in danger of death can be baptized if, having some knowledge of the principal truths of the faith, the person has manifested in any way at all the intention to receive baptism and promises to observe the commandments of the Christian religion.
A person who has not shown such intent, cannot be validly baptized, because a baptism cannot be validly received if a person beyond the age of reason does not consent to it.
Once again the beauty of free will is upheld as a great gift by the Church.
I hope this helps.