- Normal duration of pregnancy: 280 days (40 weeks)
- Counting from the first day of the last menstrual periods
- Termination of Pregnancy according to duration of pregnancy

Duration, Fetal weight, Terminology

1. < 22 weeks,  < 500 gr, Abortion
2. 22 – 28 weeks,  500-1000 gr, Immature
3. 28 – 37 weeks,  1000-2500 gr, Preterm
4. 37 – 42 weeks,  > 2500 gr, Aterm
5. >42,  Postterm

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