A muscle-bound Brooklyn felon pleaded guilty today to beating his girlfriend’s 2-year-old son to death in a deal that will get him 10 years behind bars.

Tyree Wright, 21, got angry at Jaquil Degraffenreid after the little boy made a mess playing with baby powder and backhanded the child twice, court documents state.

“It was a reckless act. There was no intent to harm the child,” defense attorney Lawrence Fredella claimed after court.

The plea deal was made after consulting with the dead child’s family, prosecutors said during court.

Wright was on probation for robbery when he beat the child to death.

jsaul@nypost.com