I'm really surprised that they didn't address that in her training, I took the foster care classes and they were very extensive on the subject. I really recommend that she talk to a professional for advice. Some of these babies are extremely touch sensitive and don't like being touched. So if the baby doesn't seem comfortable in the sling, I would back off on it until he's bigger.
I would even go so far to say for her to not cloth the baby and just keep the house a little warmer because even wearing clothes can be painful to them. It saddens me so much that someone could do that to the life growing inside of them, and so many of these little babies die or suffer long term effects.
Unassisted birthing, atheist, WOHM to 4 wonderful, smart homeschooling kids 17, 11, 6, 3