If they are no commenting interviews the baby has surely passed

no lawyer would be able to work with them surely if they knew where a live abandoned five week old was and refused to say.
I find it unbelievable that they were using foodbanks whether the baby was alive or not because it's a huge risk of being caught surely. But I think the thing is they are clearly not all there mentally/ not thinking at all rationally so we just can't apply usual laws of reasoning to their actions.
The stuff I posted a while ago about Constance's mental breaks after her experience with the cult shows just how loose her grip on reality has been for years now and that was back when she had friends and was part of society. Her mental state will have got immeasurably worse over the past 7 years since isolating with Gordon to the extent that something like this has come to pass.