Found baby ducks on side of the road...HELP!!?

Their Mother was killed by a car. Her head was taken clean off :( I brought them home, and have them in a clear bin in the bathroom. I gave them a little drinking cup and a very shallow tub of water. I got flock starter for baby birds and gave them a little of that. I'm setting up a heat lamp in a few minutes. I also put a small wild grass plant in a pot to give them something familiar. They still have most of their fluff. Only their tails have changed. They are mallards and their is only two. I am concerned as they keep making high pitched chirps and have been trying to jump out for the past 45 minutes. Is their anything else that I should do?