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.

Sláinte mháthar

Dáta dlite an linbh (EDD)

Ríomh an dáta dlite bunaithe ar an tréimhse míosta deiridh

Medically Reviewed:

Dr. Priya Sammani, MBBS, PG Dip. FM

Updated on: April 2026

❓ Frequently Asked Questions (FAQ)

Cé chomh cruinn agus atá an dáta dlite?

Ní bheirtear ach thart ar 5% de naíonáin ar an EDD cruinn (Dáta Seachadta a bhfuiltear ag súil leis) a thugtar dóibh. Is meastachán é an dáta seo atá bunaithe ar thoircheas 40 seachtain ar an meán. Is é an bealach is cruinne chun an dáta a chinneadh ná an scanadh ultrafhuaime a dhéantar ag 12 sheachtain.

Conas dáta dlite an linbh a ríomh?

De réir riail Naegele: Ag comhaireamh siar 3 mhí ó dháta na tréimhse míosta deiridh (LMP), ag cur 7 lá agus bliain. Nó: LMP + 280 lá.

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