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first month (starting with mother's
last menstrual period)
At the moment of
conception, the new life has the
complete genome of unique DNA the baby
will have at birth and beyond. Gender,
hair and eye color and other inherited
characteristics are determined at this
time. Unless specified as after
conception, the weeks are counted from
the date of last menstrual period which
is usually two weeks prior to
conception. So by the end of the “first
month,” the embryo is usually two weeks
after conception. This stage has its
most rapid rate of growth and
development. The heart and circulatory
system is developing. The heart beats at
day 18 after conception, and pumps blood
by 21 days. The neural tube is formed
that will develop into the nervous
system. At the end of the first month,
the length is approximately a tenth of
an inch.
secondmonth
The umbilical cord develops that pumps oxygen
and nutrients to the baby and removes waste. Lungs and brain begin
to develop. Brain waves have been recorded as early as 40 days
after conception on EEG. Arm and leg buds appear and progressively
grow, then elbows, fingers and toes that are initially webbed and
short. Lenses of the eyes and nostrils appear, then the rest of
the eyes and nose. The intestines grow within the umbilical cord
initially, but by the end of the second month it is into the abdomen.
The pancreas is forming. Teeth and tongue begins to develop.
Cartilage and bones begin to form, and he muscles are developed
enough that the embryo swims gracefully. By eight weeks, all body
systems are present (by 11 weeks they all function).. At this point,
the embryo is roughly ˝ inch long and weighs about .04 ounce.
thirdmonth
At the moment of
conception, the new life has the
complete genome of unique DNA the baby
will have at birth and beyond. Gender,
hair and eye color and other inherited
characteristics are determined at this
time. Unless specified as after
conception, the weeks are counted from
the date of last menstrual period which
is usually two weeks prior to
conception. So by the end of the “first
month,” the embryo is usually two weeks
after conception. This stage has its
most rapid rate of growth and
development. The heart and circulatory
system is developing. The heart beats at
day 18 after conception, and pumps blood
by 21 days. The neural tube is formed
that will develop into the nervous
system. At the end of the first month,
the length is approximately a tenth of
an inch.
