It seem Crewinverse are teasing about Three Gems and a Baby being a FINAL Story for Steven episode because they says this episode will be about Greg initially being a struggling father and tried to take care of Baby Steven
Let's be honest, Story for Steven is about Greg since he is the one who tell Steven about him and Rose.
Story for Steven is basically like a saga
1. Story for Steven- Greg first met Rose when he was 22 years old and decides to stay Beach City
2. We Need To Talk- Greg find out about Fusions
3. Greg The Babysitter- Greg finally become mature and get a job at It's a Wash
4. Three Gems and a Baby- Rose's "death" and the birth of Steven
I think this episode will have a scene where Rose give birth to Steven but she will lose her physical form
We never see a scene of Steven's Birth but until NOW! After all, How to better way to close Story for Steven Saga? Well, Show THE BIRTH OF STEVEN! Of course!
Ready for This is probably being a DUET SONG by Greg and Rose!