I dunno, younger than 5-6 I think most children don't really understand plot lines or whatever anyways so it matters less, a cartoon in English is probably as fun and engaging as one in the native language.
The only reason not to dub a cartoon is that you're an adult who cares about quality and the dubbing is usually done for a smaller audience so it is going to be worse.
There's no reason not to be dubbing cartoons for kids. That's a dorky debate for grown-ass adults playing animu purists.
There's no reason not to be dubbing cartoons for kids. That's a dorky debate for grown-ass adults playing animu purists.