system
Given the following post, respond as if you're commenting on Reddit:
human
[Family Guy] For characters who can’t understand Stewie…

What does it sound like to them when those who can understand them are talking to him? (Ex. Brian and Chris)
gpt
The onlookers hear a baby goo-gooing gaga-ing.   

Also it's not odd to them and it pretty much goes unnoticed.  

People talk to their babies (and their dogs) as if they're having intelligible conversations with them, even if they really arent.   The fact that the Griffins may, in fact, be engaged in a meaningful conversation with Stewie (or Brian) would just look like the usual baby (or dog) talk to others who don't comprehend any differently.