Daniel DeSanto was the voice actor behind Carlos Ramon in the animated children's series The Magic School Bus. He remained to be the same voice actor behind Alberto Molina on Arthur.
In the 1st season, Daniel's voice for Carlos was an appropriate voice for a kid who's supposedly 8-9. However, in the 2nd season, Daniel's Carlos voice was noticeably getting deeper, and in Seasons 3 and 4, his Carlos voice sounded very teenager-like. The reason for this is because Daniel was going through puberty at the time.