Darth Vader is a fictional person, he has a history, he likes things he dislikes things.

He was a fictional baby where he hadn't yet formed these tastes, thoughts, personality traits.

A character in a film can be within the context of his fictional world be a person but a baby can not.

It hasn't got the language skills to turn environmental data into thoughts let alone the ability to turn those thoughts into deliberations on future actions.

It can't even survive without assistance.

It is a human biologically, it has value but it's not a person.