How hens lay eggs that hatch into chicks (for 7-year-olds)

Let's learn how a tiny chick grows from an egg. I will explain it step by step, with simple words.

1. A rooster and a hen meet (fertilization).

   If a rooster (boy chicken) and a hen (girl chicken) are together, the rooster can fertilize an egg inside the hen. Fertilized means the little baby can start to grow. If the egg is not fertilized, it will not become a chick — it is the kind we usually eat.

2. The hen makes the egg.

   Inside the hen, the egg is made like this: the yolk (the yellow) is released from the ovary, then it gets white (albumen) and a shell around it. This takes about a day. The shell is hard to protect the baby inside.

3. The hen keeps the egg warm (incubation).

   To help the baby grow, the hen sits on the eggs to keep them warm. This is called incubating. People can also use a warm machine called an incubator. Eggs must stay warm and be turned a little every day so the baby grows right.

4. The baby grows inside the egg.

   Inside the egg, a tiny embryo (the beginning of the chick) starts to grow. It gets food from the yolk. Over the days, it grows wings, legs, a beak, and everything a chick needs.

5. Hatching — the chick breaks out!

   After about 21 days, the chick is ready. First it makes a small crack called a pip. Then it pecks and pushes until it breaks the shell open and comes out. This can take several hours. When it comes out, the chick is wet and tired, but soon it dries and fluffs up.

Quick timeline: From a fertilized egg to a chick is usually about 21 days.

Important notes:

• Not all eggs will hatch — they must be fertilized and kept warm.
• Eggs you buy at the store are usually not fertilized, so they won’t become chicks.
• After hatching, chicks need warmth (a mother hen or a heat lamp), clean water, and chick food.

That’s how a hen’s egg can turn into a chick — from fertilization, to making the egg, to keeping it warm, to growing, and finally hatching. Pretty amazing, right?