These chicks will be 1-5 weeks old and will still need access to some sort of heat source to warm up until they are fully feathered.
The Sussex have everything: they are great layers of tinted or light brown eggs--and they lay right through the coldest weather. They are dual purpose birds, though fat-bodied and not prone to flying when mature, so they are easily fenced. They forage well and are economical eaters that are friendly and easily handled. Their curious nature means they will often follow you around the yard if they think they can beg a treat from you. The "speckled" variety has plumage that gives them some camouflage from predators, too. Many tend to get more speckles after each successive molt, so they just get prettier with age. Seriously, what more could you ask for in a chicken?
They mature at 28 weeks and produce 250-275 light brown eggs per year.