Past Tense?

I was teaching Macu the different colors using his clothes.  I was trying to organize them to no avail coz he kept on opening his drawers and spilling them out. So I was showing him his shirt and say "yellow." Repeating it several times so he gets the pronunciation even though he can't really say it yet.  I move on to "green" doing the same thing. Then I got to "blue". He pointed his lips and I got so excited expecting him to repeat what I just said.  What he did was confusing at first, he blew air out of his mouth as if blowing a candle.  I was puzzled.  Then I realized he thought "blue" and "blow" we're the same.  Is my boy a budding genius of the English language? Hahaha "Blue" = "Blew"