I’d need more context than a single screenshot and a second of audio. What’s happening leading up to this sound? What came right after? Can you make a video clip with at least 10 seconds of audio to pair with this specific capture? Visual cues and a bit more audio around the event will help make sense of it. As is, it doesn’t sound remotely like whimpering. Or anything recognizable.

Also, The Amazing World of Gumball is an excellent show! I’ve re-watched it 3 times already, and I’m in my 40s. Despite being a kid’s show, it’s highly entertaining no matter your age.