I am so sorry for what your friends are facing. Two resources come to mind -- but check them out first to see if you think they'll "fit."
First is the book, "Expecting Adam" by Martha Beck. It's about a woman who find out she's carrying a baby with Downs Syndrome -- very insightful, real, and uplifting.
Second, there is a website called glowinthewoods.com. Here is the welcome statement:
"Mamas of lost babies and potential of all kinds: come here to share the technicolour, the vividness, the despair, the heart-broken-open, the compassion we learn for others, having been through this mess — and see it reflected back at you, acknowledged, understood."
You are a good friend.