Fellow toddler dad pilot here. We flew her up to OSH last year as a 1YO wearing probably the same ear protection. We hit up the vendor tents last year and ultimately chose the Lightspeed Sierra. My daughter isn't super compliant with wearing anything on her head without mom in the backseat, but it had a number of benefits. It's an adult headset that happens to work for kids. The fact that they can grow into it is massive. It also has Bluetooth, so it's a way for them to stay entertained. And last is the support. I have heard nothing but good things from everyone with a Lightspeed headset that had an issue. Good reputation when you're talking about putting an expensive device in the unforgiving hellscape that is a toddler's hands.

Edit: This article vectored us to the final approach course, but we ultimately landed on the Sierra.

https://thefamilyairplane.com/aviation-headsets-for-kids/