Baby food in 12th c. England

[wiseheart]

I'm writing a Cadfael story, and one of my characters has just born a child some two weeks ago. She doesn't have enough milk to feed the baby, and neither is a suitable wet nurse to find. So, what would she give the baby? Cow milk? Some mashed vegetables?

Google and food timeline didn't turn up anything useful. I went through the food and drink-labelled entries and the medieval stuff here, too, but am still clueless.

Edit: Thank you all for the helpful suggestions. Now I've got at least an idea about what would be possible.