The poor baby. I really hope, but doubt, it's ok.
The video interview linked to above seems to suggest they weren't staying on Stanmer Villas; he makes reference to the nearby open land (Wild Park?) nearby that they were heading towards.
They also say they've had no new information since the arrests; presumably they're going no comment in the interviews - a common enough tactic but it does indicate that, unsurprisingly, they've got zero interest in helping the authorities find the baby. Either they've given the baby to someone they consider safe on the agreement they can visit (unlikely IMO) or the baby has died and they've buried it in an unmarked grave, and don't want a charge of 'causing or allowing the death of a child'.