A BABY suffered “indescribable pain” after being swung by his leg and hitting a hard surface, a jury was told.

The six-week-old boy was found with severe fractures to his body, as well as sustaining bites marks to its nose by his father, it’s alleged.

Winchester Crown Court heard a 17-year-old boy, who is charged with the baby’s murder, assaulted the child after a night of drinking alcohol, the prosecution said.

Prosecutor Adam Feest QC told the court: “The baby had a twisted femur which would have caused indescribable pain for the child.

“It can’t be said this is from a single drop from someone’s arms, or from an accidental fall from a sofa

“The experts are highly suspicious that the baby was swung by the leg with his head striking a hard surface.”

The teenager and a 19-year-old woman, who is charged with child neglect, both say the baby fell to the ground during the early hours of February 11, at a flat in Southampton.

During his opening Mr Feest QC said the baby had been fit and well at 2.30am but neighbours heard screams around 3am and the baby was injured before 4.30am.

The court heard experts found further injuries in the days before his death.

Rib fractures, which were consistent with squeezing, were discovered, as well as a fracture to inner part of the baby’s collarbone.

As police continued to search the home after the 17-year-old had been arrested, they found bloodstained baby wipes in the bin and blood on the cot.

The court was told blood was found on the woman’s jacket. Police tests found it matched the baby’s DNA. Mr Feest QC says that in interviews, the 19-year-old gave no reason for it to be there.

The 17-year-old was found in a blue Adidas t-shirt, which had the baby’s blood on it. It is consistent, the crown says, with a man who had been holding a baby bleeding from its nose.

In the female’s interview with police, she described the father as being “heavy-handed with the baby", the prosecutor says.

She said he would throw the six-year-old inappropriately in the air but when he was asked to not do it, he would get defensive about it.

The mother continued to say that she knew the father had bitten the baby, but did not see it herself, the court heard.

She said when she asked him, he responded: “I did not mean to do it…I did not realise I had bitten it that hard.”

The pair, who both cannot be identified for legal reason, deny the charges.

The trial continues tomorrow morning.