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I doubt three bumped their head playing and got injured. Were they exposed to your flock, or dust or dander from your flock before they were 2 weeks old? If so, you may have a different problem. Was it directly from the hatchery to you? Or from someone who claimed they were vaccinated? If they are about 6 weeks old, and then get wobbly, can't walk or aren't really eating, or eating and wasting anyway, it sounds like Marek's. Or something in their environment. Or coccidiosis.