|
Eighteenth Week
|
Timing
|
Source |
Signs of life (i.e., quickening) are
felt by the mother.
|
18th week after fertilization |
Moore, p 109 |
| The uterus is formed. |
18th week after fertilization |
Moore, p 113 |
| Canalization of the vagina has begun. |
18th week after fertilization |
Moore, p 113 |
| In nine fetuses studied, there were
a median of 57 general movements per hour, which
were present during 24% of the observation time. |
18th week after conception |
Roodenburg, p 23 |
| In a study of 9 fetuses, the median
number of hand-to-face contacts was 95 per hour. |
18th week after conception |
Roodenbburg, p 33 |
| In a study of 9 fetuses, the median
number of head rotations was 6 per hour. |
18th week after conception |
Roodenburg, p 33 |
| Jaw movements include isolated jaw
movements, sucking, swallowing, yawning, and tongue
movements. In 9 fetuses studied, the median frequency
of any kind of jaw movements was 142 per hour. |
18th week after conception |
Roodenburg, p 28 & p 29 |
| In a study of 9 fetuses, the median
number of stretches was 6 per hour. |
18th week after conception |
Roodenburg, p 28 |
| Some scalp hair is visible. |
End of 18th week after fertilization |
Williams, p 154 |
| The rate of breathing movements was
much higher during the second hour after the mother's
breakfast or lunch than during the third hour. |
20th - 22nd weeks after conception |
de Vries (1987), p 337 |
| Breathing movements occured most often
right after the mother's meal at noon. |
20th - 22nd weeks after conception |
de Vries (1987), p 337 |
| The frequency of breathing movements
changes during the day. In a study of 10 fetuses,
such movements increased from a median of 2% of
the observation time in the morning to 13% n the
afternoon, and then fell to 11% in the evening. |
20th - 22nd weeks ater conception |
de Vries (1987), p 337 |
| The fetal heart rate decreases overnight. |
20th - 22nd weeks after conception |
de Vries (1987) p 341 |
| The daily pattern of changes in the
fetal heart rate follows the changes in the maternal
heart rate. |
20th - 22nd weeks after conception |
de Vries (1987), p 345 & p 346 |
| The frequency of hiccupping changes
during the day. In a study of 10 fetuses, the median
number of hiccups during 8 AM to 10 AM was 28 per
hour, decreasing to 12 per hour during 1 PM to 3
PM. |
20th - 22nd weeks after conception |
de Vries (1987), p 338 |
| The frequency of jaw openings changes
during day. In a study of 10 fetuses, th median
rate was 51 per hour during 8 AM to 10 AM, increasing
to 97 per hour during 1 PM to 3 PM. |
20th - 22nd weeks after conception |
de Vries (1987), p 338 |
| In a study of 10 fetuses, the majority
of movements occurred more frequently in the afternoon
and evening than in the morning. |
20th - 22nd weeks after conception |
de Vries (1987), p 337 |
| In 9 fetuses studied, the median number
of eye movements at 18 weeks after conception was
25 per hour, increasing to 101 per hour at 24 weeks. |
18th - 34th weeks after conception |
Roodenburg, p 28 |
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