| Links: human timeline | first trimester timeline | second trimester timeline | third trimester timeline
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| Week
|
Stage
|
Event
|
|
|
Clinical third trimester
|
 hearing 3rd Trimester - vibration acoustically of maternal abdominal wall induces startle respone in fetus.
|
| 27
|
|
|
| 28
|
|
respiratory Month 7 - respiratory bronchioles proliferate and end in alveolar ducts and sacs
|
| 29
|
|
tooth Week 29 - Permanent premolars (correspond to the milk molars) appear.
|
| 30
|
|
Genital male gonad (testes) descending
|
| 31
|
|
|
| 32
|
|
nail fingernails reach digit tip
|
| 33
|
|
neural brain cortical sulcation - primary sulci present[1]
|
| 34
|
|
neural brain cortical sulcation - insular, cingular, and occipital secondary sulci present[1]
|
| 35
|
|
|
| 36
|
|
 Nail Development toenails reach digit tip
Lens Development - lens growth and interocular distance plateaus after 36 weeks of gestation[2]
|
| 37
|
|
|
| 38
|
Birth
|
 Clinical Week 40
Heart pressure difference closes foramen ovale leaving a fossa ovalis
thyroid TSH levels increase, thyroxine (T3) and T4 levels increase to 24 h, then 5-7 days postnatal decline to normal levels
adrenal - zona glomerulosa, zona fasiculata present
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