H.W.
When I miscarried several years ago, one of the most meaningful things was for friends to bring me food. My husband was out of town, so it helped a lot. One client (I was a nanny for her family) dropped off a couple quarts of soup from the deli and a tree peony to plant. She knows I love to garden, so that was appropriate for us.
Food is a wonderful thing to give. After a loss, I find it very hard to be out in public, shopping, so even a meal with some non-perishables to go with it (things they might need if they presently do have kids) will also be very helpful. Shopping and being out among others when one is grieving is extremely difficult for some.