Egg Candling from day 1 to 21: The Ultimate Guide to Checking Fertility & Development

Egg candling from day 1 to 21
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Life Cycle of a Chicken (Embryo to Hatching)
Week 1: Early Development
Day 1: Bladder formation begins.

Day 2: Tissue development starts; blood circulation begins.

Day 3: Heart begins beating, and blood vessels become visible.

Day 4: Amniotic sac forms to protect the embryo.

Day 5: Elbows and knees develop; eyes become visible (candle-lit appearance).

Day 6: Beak starts forming; embryo shows voluntary movements.

Day 7: Crest begins growing.

Week 2: Rapid Growth & Feather Formation
Day 8: Feather follicles appear; ear canal opens.

Day 9: Claws develop; embryo takes on a bird-like shape.

Day 10: Egg teeth and claws fully form.

Day 11: Tail feathers start growing.

Day 12: Feathers become more visible.

Day 13: Leg scales develop; body lightly covered in feathers.

Day 14: Head shifts into pipping position (readying for hatching).

Week 3: Preparing for Hatch
Day 15: Chick begins consuming egg’s protein (albumen).

Day 16: Fully feathered; body nearly complete.

Day 17: Protein absorbed; head tucks between legs.

Day 18: Nearly fully grown; yolk sac remains outside the body. Head moves under the right wing. (Incubator "lockdown" begins—no more turning!)

Day 19: Yolk sac draws into the body; embryo fills most of the egg (except air cell).

Day 20: Yolk fully absorbed; navel closes. Chick starts breathing air and begins pipping (breaking the shell).

Hatching Day!
Day 21: The big day! Most chicks hatch within 18 hours, though some may take longer🐥🐥🐥.