I, too, would be more concerned about fluid than food, although a 25 hour fast
might not do too much damage. Jewish law does exempt from fasting anyone
whose health might be even a little harmed by it and, I believe, that includes
pregnant and nursing women. When I was nursing my kids, I did take water and
small amounts of food on Yom Kippur. (of course, since the youngest is now
16, it's been quite a few years . . .)
Linda Shaw MD FAAP