Process of elimination I guess. The police seem sure that they were alone and not being sheltered by anyone, so if they don’t have the baby with them, the baby must be gone.I don't know how it works but wondered if they have maybe charged them with manslaughter to extend the time they are allowed to keep them in custody? I also think sadly they must have some evidence pointing them in that direction. I just find it unfathomable that the baby is alive and they are no commenting their interviews. Sadly the baby has IMO probably passed and it honestly is the stuff of nightmares what the baby's short time on earth must have been like. Cold, stressed, hungry, ill and in pain probably.
It’s sickening to think about.