This patch fixes many glitches that the Baby Yoshi and the Yoshi Egg sprite have due to lacking checks or routines.
It adds to the Baby Yoshi a routine that makes the sprite disappear when an adult Yoshi is already present in the area and a pointer to an off screen routine that can be used by unchecking 'Process when off screen' with Tweaker should the user wants it.
It adds to the Yoshi Egg a sprites locked flag so it doesn't run routines when the flag is set, a pointer to an off screen routine so it doesn't cause any slowdown, a proper ground detection so it doesn't float in the air and a new proximity routine that checks the horizontal and vertical position of the player when getting near.
It's working quite nice, there's a small note with this patch: if you have more than 3 baby Yoshies their graphics start to show wrong tiles when one is offscreen. The patch didn't add this, though, it happens on a vanilla ROM as well.