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Perfectly normal.
Once they are ready the chicks start the hatching process by pipping into the air cell, so they can breathe. You may be able to see this if you candle the eggs. After this, what we call "internal pip", they will start absorbing the yolk, which will sustain them for up to 3 days after the hatch and the blood vessels in the internal membrane that breathed for the chick until then, will start retracting. This whole process, from internal pip to hatched, can take up to 30 hours, though a normal hatch usually progresses quicker.
The chick will keep breathing in the air pocket until it needs more oxygen and will then pip through the shell, "external pip". This usually happens after about 6-7 hours, though I've had internal pipes take longer to progress. I've often not seen any sign of life in the incubator until the external pips started appearing. Some chicks will wiggle and you may even hear them cheep in the shells before they pip externally. After the external pip the chicks will wait out the absorption process, which, as I said takes a few hours, so don't worry if it seems they are "stuck", it's a slow process. When they are ready to complete the hatch they will zip the shells open and emerge fully. Leave them in there for awhile so they can recover and dry off before putting them in the brooder.
The chick will keep breathing in the air pocket until it needs more oxygen and will then pip through the shell, "external pip". This usually happens after about 6-7 hours, though I've had internal pipes take longer to progress. I've often not seen any sign of life in the incubator until the external pips started appearing. Some chicks will wiggle and you may even hear them cheep in the shells before they pip externally. After the external pip the chicks will wait out the absorption process, which, as I said takes a few hours, so don't worry if it seems they are "stuck", it's a slow process. When they are ready to complete the hatch they will zip the shells open and emerge fully. Leave them in there for awhile so they can recover and dry off before putting them in the brooder.