A 9-month-old boy was was burned over 35 percent of his body when his father put him in a tub filled with scalding hot water, authorities said.

Andre Madden was arrested Monday and hit with a slew of charges one day after badly injuring the infant.

Madden was bathing his son inside an apartment on Pitkin Avenue in Brownsville on Sunday when he dipped the baby into the hot water, scalding his tiny body from the waist down.

When the boy’s mother came home, she found burns all over the lower portion of his body, police said.

Madden explained that he did not know how hot the water was and that it never occurred to him to drive the child to the hospital.

The boy’s mom rushed him to Mercy Hospital in Nassau County where he was listed in stable condition.

Madden was charged with reckless endangerment, assault, acting in a manner injurious to a child. Police also found a gun on him when they arrested him and charged him with possession of a weapon.