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Personal Pregnancy Calculator
and Fetal Developmental Charting Wheel

Developed
expressly to facilitate due date calculations for the
pregnant mother and explain what physical fetal changes to expect
during the pregnancy term. Base wheel: 5" diameter x .020". Top wheel: 3
7/8" diameter x .020" durable white vinyl plastic. A birth date calculator and
fetal development indicator, this tool allows determination of a the approximate
date for a baby's birth and tracks approximate weight and size of the developing
fetus. |
OVERALL DIMENSIONS 5" DIAMETER |
PRINCIPLE
Once a positive pregnancy is confirmed,
the next immediate questions relate to an expected due date and the physical
changes and biological symptoms one can expect during pregnancy. Pregnancy due dates
are said to be 40 weeks long. The 40 week standard estimate was first developed by German
Obstetrician Naegele in the 1800's (hence it is called "Naegele's
Rule"). He declared that a woman's pregnancy should last 10 lunar months (or 280
days), being about 9 calendar months. However, because Naegele used the first
day of the woman's last menstrual period as a definitive starting point on which to base
his calculations, and further, that conception typically happens 2 weeks after this time
(or two weeks before the woman's next period is due) a pregnancy is really only
38 weeks long (or 266 days), being about 8 ½ calendar months. Therefore, one
week after conception, a woman is said to be 3 weeks pregnant. Today, most obgyn
physicians and healthcare providers continue to use Naegele's rule as the
preferred method to calculate a baby's due date.
Naegele based his calculation on a woman having a
regular 28 day menstrual cycle. Therefore, if the mother has a regular 28 day cycle and
the date of the first day of the last normal menstrual period is known, Naegele's rule
would be used to calculate the baby's due date as follows: 9 months + 7 days
after the first day of the last NORMAL menstrual period (or
280 days after this day). Since gestational development is not generally
correlated to a woman's cycle after pregnancy commences, adjustments for
irregular cycle days are usually not necessary.
USE
The Personal Pregnancy Calculator was
developed to facilitate due date calculation automatically. The
indicator arrow on the wheel is positioned on the first day of the last cycle.
The expected due date is shown opposite the second indicator arrow.
Additionally, normal symptoms
and discomforts of pregnancy encountered
in each month and a week-by-week fetal development and
growth analysis are illustrated.
AVAILABILITY AND ORDERING
The Personal Pregnancy Calculator
and Fetal Developmental Charting Tool
is available in the sales units indicated below. Volume discounts are reflected
in the unit price. For quantities exceeding the standard sales units, please
contact our customer service
department. Overall dimensions 5" diameter.
Description |
Packaging |
Sales Unit |
Cost |
|
Personal Pregnancy Calculator
& Fetal Development Chart |
Each |
One (1)
Each |
$5.95 |
 |
|
|
Six (6)
Each |
$33.00 |
 |
|
|
Twelve (12)
Each |
$60.00 |
 |
|
|
Twenty Four (24) Each |
$114.00 |
 |
|
|
Forty eight (48) Each |
$216.00 |
 |
|
|
One Hundred
(100) Each |
$395.00 |
 |
*If the
order buttons are absent or inoperable, please use the
pricing overview page to order. |

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