Joe Lauzon's son born with cancer, but four-month-old Joey 'responding very well' following chemotherapy

Ultimate Fighting Championship (UFC) lightweight Joe Lauzon is a fighter.

So too, is his fourth-month-old son Joey, who was born back on Jan. 12 in Weymouth, Mass., with stage-four neuroblastoma. The result was a tumor "the size of an adult fist" pushing against his spine, which led to immediate chemotherapy.

Joey's mom, Katelyn Silva, talks to Children's Hospital blog:

"Having a baby is tough. Having a baby with cancer is tougher. We were upset about the diagnosis and also relieved that they decided to treat Joey right away."

The good news is, Joey has been "responding very well" to outpatient treatment and the tumor has "nearly disappeared." The little trooper is home with his parents, who were beaming during his birthday celebration earlier this week.

See what else "Baby Lauzon" is up to on Instagram right here.

Papa Lauzon, 29, is coming off a unanimous decision win over Mac Danzig last December and has been with ZUFFA for nearly eight years. "J-Lau" made his Octagon debut by knocking out Jens Pulver at UFC 63 way back in 2006, before joining the cast of The Ultimate Fighter (TUF) 5.

For more on Joey's condition click here.