|
Ninth Week
|
Timing
|
Source |
Hair folicles first appear on the
eyebrows, eyelids, upper lip, and chin.
|
End of 2nd month |
Larsen, p 309 |
| The legs are short and the thighs
are relatively small. |
Beginning of the 9th week after fertilization |
Moore, p 111 |
| Breathing movements have been detected. |
9th week after fertilization |
Boddy, p 4 |
| Breathing movements were observed
in 10 of 12 fetuses studied, with a median frequency
of about 30 movements per hour. |
9th week after conception |
de Vries (1985) p 106 |
| The eyes are closing or closed |
9th week after fertilization |
Moore, p 109; Williams, p 155 |
| The small intestine undergoes peristalsis. |
9th week after fertilization |
Williams, p 169 |
| The upper and lower lips are forming. |
9th week |
Sadler, p 376 |
| Red blood cells are formed primarily
in the liver. |
9th week after fertilization |
Moore, p 112 |
| The face is broad, the eyes are widely
separated, the ears are low-set, and the eyelids
are fused. |
9th week after fertilization |
Moore, p 110 |
| The anus is present. |
9th week after fertilization |
England, p 146 |
| The buttocks are present. |
9th week after fertilization |
England, p 146 |
| Tongue movements first occur. |
9th week after conception |
Nijhuis/deVries, p 5 |
| Yawning has been observed. |
9th week after conception |
de Vries (1985), p 116 |
| Hair begins to develop. |
9th - 12th weeks after fertilization |
Moore, p 517 |
| Yawning first occurs. |
9 1/2 - 13 1/2 weeks after conception |
Nijhuis/de Vries, p 5 |
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