A POST-mortem conducted on Constance Marten's baby has been unable to establish how the tot died.
Coroners on Friday said further tests will now take place on the two-month-old girl, found dead on Wednesday.
The child - called Victoria - was discovered under a pile of nappies in a plastic bag locked in a shed in Brighton, East Sussex.
Gordon and Marten appeared in Crawley Magistrates' Court after their arrest in Stanmer Villas on Monday.
Marten was seen blowing a kiss to her lover as the court was told the infant died sometime between January 8 and February 27.
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Yesterday the pair were both charged with concealing the birth of a child and perverting the course of justice.
They were both charged with gross negligence manslaughter on Thursday.
When they arrived at court on Friday afternoon, Gordon covered his face.
He then held the jumper over his head for the entirety of the short hearing.
During the hearing the couple spoke only to confirm their names and dates of birth and were remanded in custody.
The pair also touched hands briefly and spoke to each other as they sat on either side of prison guards.
The court heard how the couple had named their baby Victoria before her tragic death.
Marten and Gordon had been on the run for 54 days, after their burning car was found on a Manchester motorway on January 5.
The pair will be remanded in custody until a hearing at the Old Bailey on Friday March 31.
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