An Adelaide man charged with the manslaughter and criminal neglect of his newborn son has been refused bail.
Ashley John McGregor, 31, of Christie Downs, in Adelaide's south, is also facing child sex abuse charges, including maintaining an unlawful sexual relationship with a child, having sexual intercourse with a person under 14 years old, and producing and possessing child exploitation material.
Mr McGregor appeared in the Christies Beach Magistrates Court via video link this afternoon, following his arrest on Friday over the death of his 21-day-old son.
The infant died in April after being taken to Noarlunga Hospital in an unresponsive state.
The court heard the baby had extensive brain bleeding and fractured ribs, and was pronounced dead at the scene.
Mr McGregor's lawyer Andrew Williams told the court his client claimed he had dropped his son when he tripped over his dog, and that he called the baby's mother to inform her of the incident.
Mr Williams said Mr McGregor dropped the baby on April 21, two days before the infant was taken to hospital.
The prosecution told the court a preliminary medical examination of the baby boy suggested his injuries were "inflicted", contradicting Mr McGregor's version of events.
"Those injuries included extensive brain bleeding and fractured ribs," the prosecutor said.
Prosecutors told the court they were also speaking to the baby's mother.
Images 'worst we've seen'
The court also heard that additional charges related to Mr McGregor's alleged child sex offending could be laid, with "thousands of images" of a pornographic nature found on one of four mobile phones seized from him by police.
In her remarks on why bail was not granted, Magistrate Sue O'Connor stressed the serious nature of the two sets of charges Mr McGregor faced.
"The complexity of both these investigations, the fact that home detention would allow him to access the internet and phones … is such that I do not consider that it's in the interest of justice … for this man to be released on bail," she said.
Mr McGregor will appear again in court in February next year.
