It can be argued they made sure proof of how she died would be impossible to detect by keeping her body in the specific manner they did.
CM knows exactly what she is doing with the 'arrogant statements' about care and welfare as her defence for both of them and imo is talking up a storm to try and provide evidence of one set of behaviors rather than another.*
I suspect he's not on the stand because there's no birth certificate so unless they're married he legally never had PR, plus he'd be unlikely to be able to maintain the line she's taking.
She had automatic 'parental responsibility' by virtue of being the mother, and sought (understandably enough whether folk like it or not) to prevent a legal attempt at removing it. But in the meantime while she was doing that:
She failed to: safeguard her babies health and welfare in a way appropriate to a new born baby, or provide her with a home.
I have plentiful experience of raising children in very adverse circumstances and the amount of work that has to go into it to meet their needs. There's little sign of it at the time, just attempting to say it wasn't needed afterwards.
*Centering the child's needs across a range of issues, is what separates out the desperate doing their best for their child/ren with whatever they have, versus the desperate doing with whatever they have, what suits them best regardless of the effects on the child/ren.
The provide a home is* *failed, (SW may argue here) not because the home provided was a tent, but the type of tent and its suitability to constitute a home for a newborn baby in the conditions faced, (climate, foreseeable weather and temperatures, placement, lack of ground sheeting, insulation sheeting, pooling water, damp, heating devices to offset, damp, use of survival blankets etc, etc, and failure to mitigate the majority of the issues of cold weather shelter living, especially for a newborn. She'd already been challenged over flimsy tents as being suitable homes for babies.
'I kept the baby under my coat, changed her in a sleeping bag' isn't good enough 'provision of care for a newborn baby' and the visual evidence with the handling in the stroller and lack of clothing, padding etc, is further evidence not of a 'confident mother' but a 'whatever I do is automatically good enough in my opinion' mother. Claiming to be a 'confident mother' is laying claim to having knowledge and acting on it. She tripped herself up there imo.
Most negligence in most situations comes down to arrogance, lack of genuine care, and failing to have foresight in situations that have already had dangers highlighted, and most reasonable people could foresee issues arising.