My parents' neighbors have foot pedal controls in their bathrooms, for accessability - he lost both arms when he was a child.

I don't know the brand of their pedal units, but they are neat. Take some getting used to.

I will say that factoring in a kiddo age where messy handwashing/germ prevention is a concern... and the strength/coordination needed for the neighbors' particular brand of foot pedals, I'm not sure it would be a good match. It takes a decent amount of pressure to turn the tap on and keep it on. Enough pressure that a young'en might have a hard time maintaining it and/or balancing.

But that's just their particular make/model/application...

I would probably go with a remote sensor faucet instead, the kind that turns on automatically when your hands get close to it. It stays clean and obviously no germs issue (I'm not a germophobe, but I've always despised sink faucets with round-ish knobs. I know everyone's hands aren't clean when they turn it on - that's why you're washing your hands in the first place - but you have to grasp a dirty knob to shut it off. 1/4-turn lever-type handles, or single-handle faucets where you lift the lever to turn on, push down to turn off are much better, since at least I can push the lever with the back of my hand to turn water off, and the front or top of the lever in theory should be relatively clean.)