I think this theme underwent the most changes compared to the original (although only for the top screen). As often happens to me, I eventually felt that the top screen felt too empty, so I added lots more things and details... I also deleted Baby Luigi.
The original idea for this theme was that Yoshi was teaching/encouraging Baby Mario to walk, and that's it. Good morning :).
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Credits:

Baby Mario sprites by: Dazz & Ton. Yoshi sprites by: Murphmario, DogToon64 & emi3. Cloud drop and Gusty, Grinder/Ukiki, Lakitu, aqua lakitu and thunder Lakitu and jungle tileset, by: Murphmario. Various enemies sprites by: Bacon & Ton. 2-3 level (bonus room) and overgrown lakeside & cathedral backgrounds by: Barack Obama. Forest backgrounds by: Nemica, Barack Obama & MarioFanGamer. Satandard gradients and intro backgrounds by: MarioFanGamer. Sunbeams foreground by: playgames169vg.
Title screen (night version) (SMA3:YI) by: jackster (only for the logo).
Sound effects by: Raccoon Sam and Yingchun Soul.
Folder and icon templates by: Ryumaru.
Icon texture and other sprites (rip) by me.
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Above ground (SM:YI-OSV) - Koji Kondo