I have 4 chicks born 1/2nd June to Hen outside and 2 chicks born 6/7thJune from incubator Lost the mum, all other chicks died in shells and these had to be hand hatched! Today we had all chicks together for about 2 hrs on lawn with Hen. A week ago she rejected one now they all played together with no fighting and she was fine. We want to gradually intagrate. We cannot leave them to get on with it - as the outside chicks are bigger and know when they get cold to go under mum the little ones just sit and get cold so we have to put them back in the brood box. So we can;t leave them yet. - Anyone know if it would be possible for us to get mum hen to take them and when we can try to leave them over night. It is raining and cold here a lot of the time. But warm sun today!!!!!!!! How old before the chicks can go outside perminantly and how do I sex them????????????