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[Iman kiani]

That would assume my diagnosis is correct, which it may not be. In your shoes, I'd be inclined to keep momma and chicks indoors, with just water for a few hours. I'd blitz the feed in a food processor and give that to them and see if there's any improvement. Just a thought, but what are the temperatures at the moment? Including your location under your avatar helps.

It rained in the morning and now temperature is normal usually it's pretty hot

 

[Pork Pie]

Maybe this link could be helpful - http://www.backyardchickens.com/t/788391/keeping-chickens-cool-in-summer-heat and this - https://www.backyardchickens.com/threads/topic-of-the-week-keeping-chickens-cool-in-summer.1181934/