What is Stridency Deletion?
Stridency Deletion (StD) is a phonological process seen in typical development up to the age of 3 1/2 - 4 years. In StD, a strident sound (any fricative or affricate sound) is either deleted or replaced with a non-strident sound (“h” or plosives).
Examples:
shoe = -oo
stand = tand
bus = buh
soon = hoon or oon
push = put or puh
If a strident is replaced by a plosive (stop sound), it will present the same as Stopping.