The primary reason for using specifics ("dad", <name of child>, <name of sibling>, ...) is that pronouns are one of the last things a child will pick up. Think about how a child will always hear themselves referred to as "you" -- and end up assuming that "you" is like a name form them and start using "you" instead of "I"/"me".

In reality, you will be using both specifics and pronouns, and often repeat the same sentence with both versions to teach that they are identical.