Maybe your brooder is too warm. They need a warm zone and a cool zone so they can learn to regulate their body temperature. The warm zone should be about 95 for the first week, and then lower the temp each week by about 5*.
What Breed are these? - Page 2
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It will be fine for a few more days. Keep in mind that they will double in size each week, and their space requirements double with them. At 1 week old, they need about a a 1/4 of a sq ft. each. By 2 weeks they need about 1/2 a sq ft each. And by 3 weeks old, they need at least a 1 sq ft per chick.