MEMPHIS, Tenn. (AP) — Shaquoiya Stewart held one of her 6-month-old twins on her lap while Shanille Bowens held the other. As the women caught up and the babies stared at each other quietly, Bowens came around to the key question she asks all the mothers she works for: “Do you think there’s anything you need more support with?”Bowens is a doula, a provider of physical and emotional support before, during and after birth — care that used to be seen as a luxury and was available only a...