Ok so this is "brave heart ❤️ " he was the first chick I attempted to put under a broody hen the others I couldn't sneak them in. ( the landlords did that next night) as all chicks and chickens the belong to them. Brave heat had half his face peak at by mum on day one. She is Head hen and is a bit rough & a bit of a bully and this is the first time she's ever had chicks I don't think she meant to hurt him/her she was just a bit rough but he survived and four weeks has seemed to be doing well. Up until yesterday he/she has been running around the backyard happy and healthy. We had our first taste of winter here in south Australian yesterday was cold wet and windy. The chicken are all running around getting food then Hinding under a big tree in the backyard where they all sleep. I found brave heart in the middle of one of the footpaths mulch not concrete he didn't run barely moved and gave me a quiet peep when I picked him up as I am hand raising two inside I already had a heat lamp set up raced inside and placing underneath and he did not pick up I've separated him into another box with another heat lamp and have given him a good water every 20 minutes overnight he is looking a little bit better. But is so weak can barely stand when I move him towards the food he just slowly crawls back to the light and is a lot lot smaller than the other four birds more than I realized. Could it be from the Head injury or maybe he's picked up something? he's not showing any symptoms other them being lethargic and weak.???? we got them on the 25th of February so 4 weeks old the others are around 144g-170g but brave heart is only 70g. i have worming stuff but i still see no improvement. please please can anyone help me this is big bird with brave heart you can see the size difference.