Boxer 'Kid Chocolate' -- My Wife's the Real Champ ... After 36 Hour Labor!!!

Talk about stamina ... boxing champ Peter "Kid Chocolate" Quillin tells TMZ Sports his wife is the REAL bad ass in the house after giving birth to their son after a 36 hour labor!!

Peter -- the reigning WBO middleweight champ -- says his son Joaquin was born last Saturday ... 8 pounds, 2 ounces ... and he's already got a nickname, "King."

"There is nothing comparable to witnessing your child being born ... I cried tears of joy."

But Peter says he couldn't be more proud of his wife -- "She's a true champion. She was in labor for 36 hours and was calm during the delivery."

And get this ... Peter says he already has big plans for his son -- "He will be a future champ and I just know we are going to shake up the boxing world!!!"