There was no explanation for the sudden death of a nine day old baby who had been found in his cot with blood in his nose and in a serious condition, an inquest has found.

Baby Reece Dines had lost weight since his birth and was experiencing diarrhoea and his mother told a coroner that she was planning to take him to see a doctor "because he wasn't right."

However, nothing could be found in a post-mortem examination to explain how he had died.

His mother, Amy Dines, said she went into labour at 24 weeks but gave birth at 37 weeks into her pregnancy. Reece was born on April 11 this year and they were able to take him home.

Mrs Dines, who also has a young daughter, said: "I can't breastfeed due to the medication I'm taking and we started Reece on Cowgate formula, but we changed this to Aptamil at the advice of my midwife because Reece was sick quite a lot after feeding. He was sick less after changing the formula.

"He had no health conditions or allergies and was having no nose bleeds. My midwife last saw him on day five and he had lost five ounces since birth. He had been whingey and crying and he also would scream at night and he had diarrhoea.

"On April 19 at around 4pm I took Reece down to the communal area where there is a playground and a paddling pool had been set up. Bill (Reece's father) had taken our daughter downstairs and she was playing in the paddling pool."

Both parents had some alcohol and stayed at the party with their neighbours enjoying the nice weather. They stayed for several hours at their home address in the new build development Lansdowne Place, Taplow.

Mrs Dines took Reece up to bed at around 10pm and put him in his Moses basket and the parents chatted for a short while before Mr Dines went to bed as he had to get up for work the next day.

Mrs Dines reported: "Reece woke up crying at about 4am and I fed him, he took about one ounce of feed. I was holding him in the crook of my arm and I must have fallen asleep with him in my arm.

"Bill woke me up, I was laying on my left side with my head on a pillow. I picked Reece up and put him in his Moses basket. After I put him down I went back to sleep."

Mr Dines told the inquest in Beaconsfield last Wednesday that when Mrs Dines put Reece in the Moses basket, he had had a little grizzle but then was fine.

He said: "I woke up and went to work at 5am. I gave Reece a kiss and he was warm, I am sure he was alive. If not, I would have felt it on his lips."

Mrs Dines continued: "When I woke up I saw Reece's blanket was by his feet, I picked him up and he felt cold, and then I saw blood in his nose."

She had called Mr Dines firstly and he had shouted at her to ring for an ambulance. Police records showed South Central Ambulance Service had been responding to her call at 7.56am.

Dr Colene Bowker, who conducted a post mortem examination, told the coroner: "There is no evidence of trauma, infection, pneumonia or meningitis.

"There was a cytogenetic abnormality that needs to be looked at a little bit more but that's outside the remit of the coroner's inquest.

"The conclusion is really that we cannot fully explain why Reece died. It fits into 'sudden unexplained death in infancy'.

"We have looked into everything we can possibly and unfortunately there are certain things that we can't rule out."

Mrs Dines said: "He wasn't right. I told my mum I was taking him to the doctor because he wasn't right."

Senior coroner for Buckinghamshire, Crispin Butler, said: "A mother's feeling that there was something not quite right but on the balance of probability, a sudden natural event has occurred.

"We know that he was found unresponsive in his Moses basket at his home address shortly before 8am in the morning. He died at Wexham Park Hospital at 8.37am.

"He's died of natural causes, it's sudden and unexpected just nine days after he was born."