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Appendix 3
Movement and Learning Patterns of the Unborn Child and
The Development of the Senses
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Jaw Openings
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Timing
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Source |
Jaw openings first occur.
|
8 1/2 - 10 1/2 weeks after conception |
Nijhuis/de Vries, p 5 |
| Jaw openings were observed in 10 of
12 fetuses studied with a median rate of about 18
per hour. |
10th week after conception |
de Vries (1985), p 114 |
| Jaw openings were observed in 12 of
12 fetuses studied with a median rate of about 30
per hour. |
12th week after conception |
de Vries (1985), p 114 |
| 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 |
| The frequency of jaw openings changes
during day. In a study of 10 fetuses, the 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 |
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