How are Babies Made?How are Babies Made?

Definition:Definition:Fertilisation is the fusion of the nuclei in a sperm and an egg to form a new life.

Fertilisation normally occurs during sexual intercourse.

What is Fertilisation???

What is Fertilisation???

sperm + egg = fertilised eggsperm + egg = fertilised egg

Fertilisation

Human life begins at fertilisation.

Fertilisation is the union of a sperm and anegg usually in the fallopian tube to

form a fertilised egg or zygote.

How are Babies Made?How are Babies Made?

uterusuterus

eggeggovaryovary

testistestis

fertilised eggfertilised egg

embryoembryo

uterusuterus

penispenis

vaginavagina

uterusuterus

bladderbladder

penis is inserted into the vagina

during sexual intercourse

penis is inserted into the vagina

during sexual intercourse

millions of sperm are released from the penis are are deposited in the vagina

millions of sperm are released from the penis are are deposited in the vagina

sperms swim from vagina up the uterus and into the

fallopian tubes; many sperms die before reaching

these tubes

sperms swim from vagina up the uterus and into the

fallopian tubes; many sperms die before reaching

these tubes

if a sperm meets an egg in a fallopian tube, fertilisation

takes place; only one sperm will fertilise the egg

if a sperm meets an egg in a fallopian tube, fertilisation

takes place; only one sperm will fertilise the egg

the fertilised egg/zygote begins to divide to form a small ball of cellsthe fertilised egg/zygote begins to divide to form a small ball of cells

the small ball of cells (now embryo) moves

down the fallopian tube and enters the uterus

the small ball of cells (now embryo) moves

down the fallopian tube and enters the uterus

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). – gestation period

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months). – gestation period

During implantation, the embryo reaches the uterus and attaches itself onto the wall of the uterus.

Cell division continues.

During implantation, the embryo reaches the uterus and attaches itself onto the wall of the uterus.

Cell division continues.

First week

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

After the placenta develops in the wall of the uterus, the embryo joins to via an umbilical cord. The embryo receives

food and oxygen from the mother and pass waste substances back through the umbilical cord and placenta. The placenta also stops infections and

harmful substances from reaching the embryo. A surrounding liquid also

protects the embryo.

After the placenta develops in the wall of the uterus, the embryo joins to via an umbilical cord. The embryo receives

food and oxygen from the mother and pass waste substances back through the umbilical cord and placenta. The placenta also stops infections and

harmful substances from reaching the embryo. A surrounding liquid also

protects the embryo.

After 2 weeks

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

Eyes, arms and legs begin to form. A little tail is also visible.Eyes, arms and legs begin to

form. A little tail is also visible.

After 4 weeks

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

Nose, ears and fingers can be seen.Nose, ears and fingers can be seen.

After 7 weeks

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

Embryo looks like a baby. From this stage until birth, embryo is called a

foetus.

Embryo looks like a baby. From this stage until birth, embryo is called a

foetus.

After 11 weeks

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

The foetus looks more and more like a human baby. The fingers and toes

can be seen clearly.

The foetus looks more and more like a human baby. The fingers and toes

can be seen clearly.

After 20 weeks

A New Life is BornA New Life is Born

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

When a woman is going to have a baby, she is said to be pregnant. A pregnancy lasts for about 38 weeks (9 months).

After about 9 months, the baby is born.

After about 9 months, the baby is born.

After 38 weeks

A New Life is BornA New Life is Born When the baby is about to be born, the head of the baby faces down. Muscles in

the uterus push the baby down.

When the baby is about to be born, the head of the baby faces down. Muscles in

the uterus push the baby down.

muscles of uterus

muscles of uterus

The membrane around the foetus breaks and the liquid comes out.

The membrane around the foetus breaks and the liquid comes out.

membrane around the foetus

membrane around the foetus

Mother uses her muscles to push the baby out of the vagina. Baby comes out with the umbilical cord attached. Doctor cuts and

ties the cord. Placenta is released from the vagina as it is no longer needed.

Mother uses her muscles to push the baby out of the vagina. Baby comes out with the umbilical cord attached. Doctor cuts and

ties the cord. Placenta is released from the vagina as it is no longer needed.umbilical cordumbilical cord

placentaplacenta

vaginavagina