Got an HOV warning even though I had 3 people

Like the title got an HOV-On warning saying it didn't look like I had 3 people, but I'm guessing my 10mo old is hard to spot. It says ignore it if I do have 3 people, but will I get eventually get billed if they keep missing the baby? How are they reading 3 people that they are missing the baby, I'm guessing a regular camera won't always show 3 people. Asking because I did get billed one time when for some reason my EZ Pass didn't register, and it's an insane PIA to fight the charge.