Newborn babies have 100 billion brain cells. Some infants are preconnected with brain cells at birth stage itself. However, much of the brain’s development starts after birth and prior to the age of 3. The initial three years of life are the stages of incredible growth in all areas of a baby’s progress.

2. A single fertilized egg
matures into a full-term
fetus over the course of
approximately 38 weeks.
This development is
remarkably complex, as a
newborn infant emerges
from the womb with
essentially a full set body
parts already formed.

3. There are four different stages, there are :
Zygote Stage
Blastocyst Stage
Embryonic Stage
Fetal Stage

4. The mother's egg is
fertilized by the father's
sperm as it travels
down one of her
fallopian tubes. This
fertilized egg is called a
zygote. In some cases,
two eggs are released in
the same menstrual
cycle.

5. The zygote divides and
replicates itself, rapidly
forming a ball of several
hundred cells called the
blastocyst. It is only one
layer of cells thick in all
but one region, where it
is three- to four-cells
thick.

6. A part of the placenta
forms a transparent,
fluid filled membrane
called the amniotic sac.
The embryo floats in this
fluid, attached to the
placenta via the
umbilical cord. The main
parts of the body all
form during the
embryonic phase.

7. By the start of the fetal
stage, all of the main body
parts and organs are present.
During this stage, the fetus
grows greatly in size while
the various body parts
undergo a finishing process.
In week 8, the eyelids close
to cover the developing eyes
of the fetus. They remain
closed until week 28, when
they open and begin to
periodically blink open and
closed.

8. This is how the journey of
humans birth will happen
with different stages and
finally we welcome the
young baby.