Should i be concerned that strangers can't understand my child's speech?

Clarity takes time: Half of what a 2yo says should be understood by strangers, 3/4 by 3 & 95% by 4. Local school districts begin looking for those with speech or language issues starting at 3 yo so the can be brought up to peer level by school entry. Share any concerns with your pediatrician and see if a referral is appropriate.

It's age dependent: The rule of thumb is that more than 50% is intelligible by age three to strangers. A four year old's speech should be mostly clear to strangers. If this is not the case and you are still concerned please talk to your pediatrician.