User blog comment:Destructivedisk/D-Disk Reviews/@comment--20120804035943/@comment--20120804183244

Vegeta was 2.5 years old when he fought Piccolo. I am pretty sure that a 2 year old can talk. Vegeta beat Bardock, because Bardock had a power level of 8000 during the fight. True, Vegeta only had 4520, But he did have a Senzu Bean during the fight. That doubled his power level.

The reason, his power level was so high, is because of the 2 senzu beans he had during his fight with Nappa.