Why are black mothers and babies more likely to die? Is it they less likely to be listened to with concerns?
A big part of the problem is that we don't know the answer to that question.
Probably partly less likely to be listened to (we already know women in general are less likely to be listened to than men).
And it's quite likely there are different risk factors. We know, for example, that black people have different risk factors for cardiac health and are likely to respond differently to some drugs. We also know that women respond differently to a lot of drugs. Most medical research has been carried out on men, and results tend not to be analysed by either sex or ethnicity.
And - for reasons not unrelated to the above - trust of medical professionals is lower, so they may miss out on antenatal care. In the US, which has particularly bad outcomes for black mothers and babies, there's also the income/insurance problem.
We know it's a problem, we know there are a multiple reasons but not really the specifics of why or how to solve it. That's the sort of thing where equality funding and policies could really make a difference.