A group of eggs/chicks laid or hatched together is often referred to as a "hatch", "brood" or "clutch".
a number of young hatched at one time, a family of young, is known as a Brood
having hatched numerous chicks i can say that all chicks are not yellow. in my experience the yellow chicks become white or pale coloured hens, i have hatched grey chicks, brown chicks & black chicks
Coaltit eggs typically take about 14 to 16 days to hatch after the female begins incubating them. Incubation usually starts after the last egg is laid to ensure that all the chicks hatch around the same time. Once hatched, the chicks are dependent on their parents for food and care.
The chicks should all stay in the incubator until the hatch is complete and the chicks are fluffy and dry. They should all be moved to the brooder box at the same time. The chicks will roll the peeping eggs and that is ok. Sometimes the movement of the completed chicks will get the emerging chicks to begin and that is a good thing. Do not be hasty in removing the newly hatched chicks from the incubator, they can and should remain in there for up to 24 hrs.
The gestation period for American coot eggs typically ranges from 21 to 24 days. After laying the eggs, the female incubates them, and both parents may be involved in protecting the nest. The eggs hatch asynchronously, meaning that not all chicks will emerge at the same time. Once hatched, the chicks are precocial and can swim shortly after.
the chicks will be many
The male emu is the one who incubates the eggs. For the entire time he is sitting on the eggs that (usually) several females have laid, he does not eat or drink, but just stands several times a day to turn the eggs. That is the only movement he makes until the chicks have hatched. He is also the one who raises the chicks.
Springtime is the usual time to start a hatch. It depends on where you are and the weather conditions. Plan for the clutch to start incubation when temperatures reach above zero continually so the newly hatched chicks do not suffer from extreme cold. Naturally brooded chicks will use the broody hen for a heat source for about 3 weeks after hatch.
When a group of baby chicks is hatched around the same time by the same hen, it is a called a clutch.
Just let her be. The newly hatched chicks will take up some of momma's time and the room under her but the mother hen will adjust things by herself. Trying to do this for her will just stress her out and may cause her to leave the nest. The new chicks will find room under her wings eventually and mother hen will roll the unhatched eggs closer together.
two chicks at the same time
They aren't related at all. They just were born/hatched at nearly the same time.