about 5 weeks... then it's a pullet for a while, which is like the teenager for chicks. they kinda look like chicken size chicks. it takes 5-8 months from birth, on average, for a chicken to start laying eggs.
Many chicks are artificially incubated and have no "parents" in that sense of the word. Chicks that are hatched under a hen will remain close to the hen as part of the flock for as long as they live....
Chicks can be removed from the brooder once the temperature of the brooder matches the ambient temperatures in their intended living quarters. If the new chicks are to be introduced to an established...