This is my first time hatching chicks, so I dont know if there's an unspoken rule about mixing chicks that hatch on different days. My first two chicks weren't immediately mixed with the later born because they looked a little sick. But now that they seem just fine I put them together and they don't peck or cause problems. However now that I have more seemly healthy chicks come in and limited light/feeding space it would be a lot easier to put them all together and only separate them when something is noticeably wrong. These will be 4 day old chicks mixing with < 24 hour chicks and besides keeping them separate when weaker/sick can you put all newborn chicks together?