Is it possible to over handle chicks? I've only had my chicks for 3 days so I have zero experience. Two of my little cousins came over today (age 8 and 10) and they, of course, wanted to hold and play with them all the time. I made sure they kept the chicks under the heat lamp so they wouldn't get cold and told them that the chickies had to take a nap(and eat!!) every once in a while. Any signs to watch for- when the chicks have had enough?