Egg Incubation 101: How to Hatch Healthy Chicks at Home

🐣 Your First Hatch: Egg Incubation Basics That Actually Matter

Hatching your own chicks feels a little like science… and a little like magic. One day you set eggs in the incubator, and just a few weeks later, tiny peeping chicks are pushing their way into the world. But between Day 1 and hatch day, a lot has to go right inside that shell — and most of it has nothing to do with luck.

Temperature matters.
Turning matters.
But humidity matters more than most first-time hatchers realize.

Incubation simply means keeping fertilized eggs warm enough, long enough, for a chick to grow inside. A broody hen does this naturally by sitting on her eggs, while an incubator does the same job using controlled heat, airflow, and moisture.

Inside each egg is:

• A developing embryo
• A yolk for nutrition
• An air cell for breathing
• Fluid that slowly evaporates over time

That last part — evaporation — is where humidity plays one of the biggest roles in a successful hatch.

Why Humidity Matters So Much

As an egg incubates, it naturally loses moisture through the shell, and this is actually a good thing. As moisture leaves the egg, the air cell inside gradually grows larger, creating the space the chick will need to breathe and position itself properly for hatch.

Humidity controls how fast this moisture loss happens.

If humidity is too low:

• The egg loses too much moisture
• The chick becomes dehydrated
• The inner membrane dries out
• The chick can become shrink wrapped

Shrink wrapping happens when the membrane dries tightly around the chick like plastic wrap. A chick may pip — meaning it cracks the shell — but then get stuck and be unable to turn or finish hatching.

If humidity is too high:

• Not enough moisture escapes
• The air cell stays too small
• The chick struggles to breathe
• The chick may drown inside the egg

The goal is steady, controlled moisture loss.
Not too fast.
Not too slow.

The Basic Incubation Timeline

Chicken eggs typically hatch in about 21 days. During the first 17 days, the focus is on development, and in a forced-air incubator, temperature usually stays around 99.5°F while humidity is often kept between 40–50%.

Throughout this time, eggs should be turned several times each day to prevent the embryo from sticking to one side of the shell.

Turning helps:

• Prevent deformities
• Support proper positioning
• Improve hatch success

Around Day 18, things begin to change.

This stage is called lockdown.

What Is Lockdown?

At lockdown:

• Egg turning stops
• Humidity is increased (usually 60–70%)
• The incubator should stay closed as much as possible

Inside the egg, the chick is now moving into hatch position, preparing to breathe using the air cell, and absorbing the last of the yolk.

Right before hatch — usually around Days 18–21 — the chick pulls the remaining yolk from the egg into its body through its belly button (called the navel). This yolk becomes a built-in source of food, energy, hydration, and antibodies for the chick’s first 24–72 hours after hatching, which is why newly hatched chicks don’t need to eat or drink right away. During this time, blood vessels in the membrane are drying up and the navel is closing, and if a chick hatches too early (or is helped out of the shell too soon), the yolk may not be fully absorbed, increasing the risk of bleeding or infection.

Higher humidity during lockdown helps keep the membrane soft so the chick can rotate and push its way out.

Opening the incubator too often can:

• Drop humidity
• Dry the membrane
• Cause stuck chicks
• Delay other hatchers

Hatch Day: What to Expect

Once a chick pips — meaning it makes the first small crack in the shell — it may still take anywhere from 12 to 24 hours to fully hatch. During this waiting period, the chick is resting and continuing to absorb blood vessels from the membrane before making its final push out of the shell.

You might hear terms like:

• Pip – the first crack
• External pip – breaking through to outside air
• Zip – cracking around the shell in a circle
• Hatch – fully out

That waiting period is normal.
And necessary.

Start with the Basics — Hatch with Confidence

When you see a chick struggling, it’s tempting to step in and help. But most chicks need time — not assistance — and opening the incubator too often during hatch can do more harm than good.

Once you understand:

• Why humidity matters
• What shrink wrapping is
• When lockdown starts
• What a normal hatch timeline looks like

You can focus on giving your eggs a stable, consistent environment.

And when those first tiny peeps start echoing inside the incubator —
you’ll know exactly what’s happening inside the shell.