For a number of years, the name Yamilex has been spiralling downward in popularity. In recent years, continuing the trend, the number of babies given the name Yamilex has dropped significantly.
Re: Size of full shirt decal for Gilden kids shirt. General image (imprint) size parameters for standard youth tees is 7-9 width. Height is the same. 11 shouldn't be a problem but I wouldn't go taller. Youth extra small is limited to 5-6 for a comfortable placement.
1 For Chrome or hard plastic emblems, apply steady pressure for 30 seconds to ensure good adhesion.  For vinyl decals & sticker type emblems, you can use a dull flexable tool to smooth out any air bubbles. Be sure the tool is free of any sharp edges or burrs, you don't want to snag or worse yet, tear the decal.