Forcing them to stay under the heat lamp is a bad idea Julia. They need to be able to get away from the heat if they get too hot. You want to warm them, not bake them.
I remember when I got my first chick. My kindergarden class visited a hatchery in 1968 and if we had a permission slip signed by our parents they gave each of us a free chick as a lovely parting gift. Mine promptly pooped in my hand which cause me to promptly puke. I been getting pooped on by...