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Embryo Development Summary

Normal Development of Eggs
* You may be able to start seeing something by day 3 - veins may start to be apparent.
* The best indicators of progress are veins and blood vessels that continue to grow and spread.
* At about 8 days, you can see the peep wiggling and kicking in his egg.
* As the hatch progresses the air pocket in the egg should be getting larger and the egg will be getting darker as it is filled with more bird.
* During the last 3 days of a hatch, it is best to avoid candling the eggs unless you have a specific reason to.

Signs of an Egg Gone Bad
* A vague ring inside the egg and little or no veins.
* After 10 days the egg is still clear.
* A very distinct blood spot with little or no veins.
* Lack of development compared to the rest of the eggs in the hatch. But don't give up on them until they are for sure not developing, some eggs may appear to be behind, but it may just be the viewing angle or a number of other factors.

Egg Candling Tips:
* If you are having trouble viewing the egg contents, turn out some lights or go into a dark room/closet.
* Eggs can be out of the incubator for up to 30 minutes, but it is best to put them back as soon as possible.
* You can candle your eggs every day if you’d like, after day 3 you should see something.
* Be sure your hands are clean and dry. Oil from your fingers can clog the pores in the egg shell and keep the embryo from getting the oxygen it needs.
* At about 8 days, you can see the peep wiggling and kicking in his egg.

Image Credit (Learning Resources Chick Life Cycle Exploration Set)

Day by Day Egg Development