Do not reintroduce the mom like Mike said. I make sure the water bottles are low enough for them to reach (also check the ball in the sipper and make sure it only takes a very light amount of pressure to turn).
When I was feeding blocks, I also broke them up into smaller pieces, but now I'm using hog feed (thank your for your topic on that Mike!), they can eat it with no problem. They can actually eat blocks fine by themselves at this age, but I liked to break the blocks up because I felt bad watching a tiny little baby try to eat something the same size it was.
It's hard to believe they'll be ok without mama because they're so tiny and cute, but they will be. Just keep an eye on your food and water levels and make sure they are both going down and you'll be fine.