Adoption protocol Washington 1970’s Mystery

I was adopted through private adoption at a hospital in Renton Washington. From the date I was born to the date I was handed over to my parents, there is a three day gap.

I want to know about the three day gap.

I know I was immediately removed from my bio mother who never saw me. My bio father was told I was a boy. So he didn’t see me. I’m not.

My adopted parents were told about me, and my dad was furious that I was in the hospital alone and he couldn’t get to me, so I know they knew I was there’s.

Any idea how I would find out? This would be the mid 1970’s.

The Doctor is dead. His office closed.