Ratana fled, but was apprehended by police at a Taradale phone booth about 4.30am, and in statements over the next few days, told police the girl died while he was admonishing her as she played up.
He had said he panicked, put her into her bed, tried to ignore what had happened, gave the other children their tea and put them to bed, and started drinking a bottle of whisky.
Relating to the moments after Ms Baker found her daughter dead, Ratana denied saying he had raped the child.
Mr Walker said medical evidence was that Sahara died from a heart injury consistent with significant force.
Defence counsel John Rowan QC reiterated that the manslaughter admission had nothing do with whether Ratana may have committed any sex offence.
The Crown is calling evidence from 10 witnesses, including Ms Baker, police and forensic and medical experts.
The trial is expected to take up to four days.