My bf daughter 10 months is in nursery 3 1/2 days a week. I go and feed her at lunchtime, and have been sending in a few oz. expressed milk for morning and afternoon feeds (though she doesn't often drink the afternoon one).
I am getting to the end of my tether as a result of a lot of non-bf-related things and need to cut as many 'tasks' out of my life as possible to make things a bit easier. Expressing those two feeds (and cleaning the pump, and remembering the milk and cold pack, and keeping track of how much we have stashed) could be one of these things I cut out, especially as she eats well and feeds well from me other times.
So I thought I could switch her to formula just for those few feeds a week, but we've just tried her on it and she's not keen, at all. (I don't blame her, it smells rank! and quite different from her usual milk.) Do you think it would do any harm to just give her cow's milk for that morning and maybe afternoon snack 4 days a week, continuing to bfeed the rest of the time? She already has cow's milk on cereal and likes it.