Something reminded me of this earlier this evening.
When Kiddo was about 4 or 5, I was driving down the road and she was in the back in her car seat. Kiddo proclaimed that she could count in Spanish. I figured I would play along and told her to go ahead. It went a little something like this:
Kiddo: One is uno.
Kiddo: Two is dos.
Me: very good
Kiddo: Three is tres.
Me: nice job
Kiddo: Four is twat-ro.
Me: (after recovering from nearly driving off the road from bouts of laughter) Almost, Kiddo, that's CUATRO.