This was really good! I wanted to say your kid voice reminded me of Billy Madison, and I lost it lol

In the beginning, the voice makes me think of goofy a little bit.

it sounds like you are saying 14 years old. I think this is okay - but it feels like it's in a weird placement that makes it not as organic. I liked some of your choices, but it felt a bit purposeful - so I would want to work on more spontaneous delivery - 3 year old was fun - he could use some physicality and reactions - are his diapers full of poop? kids can tend to be scattered from one thought to the next...so that's another OPTION you could do - then it wouldn't feel as much like Line - pause, Line pause. Loved that you're playing with character stuff though.. look forward to hearing more