Production:
The tip of the tongue is raised to nearly contact right behind the teeth, while the sides of the tongue contact the upper teeth. This creates a small groove at the middle of the tongue. The /s/ sound is "unvoiced", meaning when you put your hand on your throat and say the sound there should be no vibrations. The /z/ sound is a "voiced" sound, meaning when you put your hand on your throat and say the sound there should be vibrations.
Tips to say the /s/ or /z/ sound: peachiespeechie.com/videos
your child to try:
Here are some of the many fun activities you can do at home to practice your speech sounds!