As the infant boy cried and screamed the morning of Sept. 21, according to police, his father took him to the balcony of the family’s apartment and began punching him in the torso to quiet him.

When that did not work, the father brought the infant back inside, snatched the still-crying boy by the arms off the floor and continued punching him, police said in arrest records.

Blood began to flow from the baby’s nose and mouth, police said, and the child fell silent.

Court charging documents released Thursday reveal details in the death of 3-month-old ­Antoine Flemons, who Prince George’s County police said was fatally assaulted by his father before being buried in the woods by his parents.

The records also indicate that when the baby did not rouse after the assault, his parents left him in their 1998 Lincoln Town Car for 24 hours before driving his body to the back of a high school and burying him in a shallow grave.

Antoine Flemons (Prince George’s County police)

The remains stayed covered for several weeks before police unearthed the body the morning of Oct. 19 and charged Antoine Petty, 32, and Geneice Petty, 24, in connection with the infant’s death.

[The baby was missing for a month. He was found buried in the woods.]

Family members reported the baby missing Monday, but the child had been dead for nearly a month before detectives tracked down the couple and were led to his burial site behind Parkdale High School in the Riverdale area, according to police.

After the baby’s death, the couple would tell relatives that the child was with others or offer other explanations for his whereabouts, said Lt. Dave Coleman, a spokesman for Prince George’s police.

Antoine Petty has been charged with first- and second-degree murder and related crimes. Geneice Petty is charged with being an accessory after the fact.

Antoine Petty was being held without the possibility of bail, and Geneice Petty was being held on a $120,000 bond, according to the Prince George’s state’s attorney’s office. A bail review hearing is scheduled for the couple Friday.

Online court records do not indicate whether the Pettys have attorneys. A woman inside the couple’s Greenbelt apartment declined to comment to a reporter who knocked on the door Thursday morning.

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A man who answered the phone at an address listed for relatives of Geneice Petty’s asked for privacy so that the family could seek “closure and peace.”

“It’s heartbreaking, and it’s horrifying,” Coleman said of the allegations. “Everyone who sees this is so sad for the child and everyone involved.”

A review of online court records indicates that Antoine Petty has previously been charged with crimes including theft and assault and has a record going back to at least 2002.

In 2014, Prince George’s police featured him as a suspect in the department’s regular “Wanted Wednesday ” blog, which made national news when the posting included a mug shot that showed his extensive facial tattoos.

Detectives in the 2014 alert were searching for Petty on what they said was suspicion of having stolen a gun from an acquaintance in Largo.