How accurate is the due date?

Only about 5% of babies are born on the exact EDD (Expected Date of Delivery) given to them. This date is an estimate based on an average 40 week pregnancy. The most accurate way to determine the date is the ultrasound scan done at 12 weeks.

How to calculate the due date of the baby?

According to Naegele's rule: Counting back 3 months from the date of the last menstrual period (LMP), adding 7 days and a year. Or: LMP + 280 days.

Soifua Maloloina o tina

Aso fanau pepe (EDD)

Fa'atatau le aso e fa'atatau i le ma'i masina mulimuli

Medically Reviewed:

Dr. Priya Sammani, MBBS, PG Dip. FM

Updated on: April 2026

❓ Frequently Asked Questions (FAQ)

O le a le sa'o o le aso e tatau ai?

E na'o le 5% o pepe e fananau mai i le EDD (Fa'amoemoeina Aso o le Fa'ata'ita'iga) na tu'uina atu ia i latou. Ole aso lea ole fa'atatau ile fua ole 40 vaiaso ole maitaga. Ole auala sili ona sa'o e iloa ai le aso ole su'esu'ega ole ultrasound e faia ile 12 vaiaso.

E fa'afefea ona fuafua le aso e tatau ai ona fanau mai le pepe?

E tusa ai ma le tulafono a Naegele: Toe faitauina le 3 masina mai le aso o le maʻi masina mulimuli (LMP), faʻaopoopo le 7 aso ma le tausaga. Po'o le: LMP + 280 aso.

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Fa'alapotopotoga o le Soifua Maloloina a le Lalolagi (WHO) ma ta'iala fa'afoma'i fa'apitoa fa'afoma'i fa'asalalau ma fa'ata'ita'iga masani.

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Medical Disclaimer: These calculators are provided for educational purposes only and are not a substitute for professional medical advice. Always consult a qualified physician regarding any health concerns..