Marina Tilby, 26, took son Darian back to a caravan with two men she met on a night out in New Quay in Wales.

She had been clubbing with her sister, and was seen repeatedly throwing and catching her son on the night out.

Yesterday a judge branded the incident a “dreadful case of maternal selfishness” and criticised the mum for the “deliberate neglect” of her child.

Swansea Crown Court heard the baby boy was found unresponsive with blood in his mouth lying next to Tilby in the early hours of March 31, 2017.

Boozy mum took baby to nightclub and tot died when she fell asleep on top of him

Tilby was so drunk she was unable to be roused from her sleep by her sister, who had also stayed at the caravan, for more than an hour.

Baby Darian was taken to Bronglais hospital, where he later died.

Prosecutor Catherine Richards said Tilby had drunkenly fallen asleep on top of her child, but medical evidence could not prove her rolling on top of him contributed to his death or rule out he may have suffered sudden infant death syndrome.

Judge Paul Thomas told Tilby she had “completely ignored” her duty to protect her son and said it would never be known if doctors would have been able to save him if she had raised the alarm sooner.

He also expressed his “unease” that it could not be proved what caused the baby’s death.

The judge said: “It is a mother’s responsibility, a mother’s duty, and her natural instinct to put the care and safety of her four-week old child above all else.

“You completely ignored that duty so you could get extremely drunk on a night-out.

“So drunk were you that you fell into a deep sleep and slept on top of your baby. There came a time when he was not moving. He had blood in his mouth, but you didn’t realise because you were so drunk.

“You showed deliberate disregard for the welfare of your son.”

Tilby, from Llwyncelyn in Aberaeron, Ceredigion, was sentenced to two years and four months in prison.