Can anyone help with a solution to this?
6 week old chicks laying on back
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They might be getting too hot. I would move away the heat source so they have a hot corner and can get away from the heat if they need to.
Give them water with SaveAChick electrolytes and vitamins right away.Dip their beaks into it as often as possible. What temperature are you keeping them at in the brooder? At 6 weeks they should tolerate 70 degrees with no drafts. How long have you had them? Are any not eating or drinking, having diarrhea or blood in droppings, or standing around hunched or puffed up? Dehydration, overheating, or coccidiosis could cause this behavior.
x2. You can also set up a "cooling station" for the birds. If possible, you can rig up a misting system, very, very fine mist to prevent chilling, but this is more long term for future batches. You could also set up a shelter, you can fashion a "house" out of bricks, or buy a shelter from a pet store or online. Then move the heat lamp up a little, so the heat isn't as intense. This could be early signs of neurological problems, but with multiple chicks showing the problem, and at six weeks, I doubt that's what this is. Good luck!