Guides
BabyData guides explain the rule behind each tool in plain English and link to the calculator that does the maths. They cover how your due date is calculated, your fertile window and ovulation, UK maternity pay and leave, and how to choose a baby name. Each guide cites its official UK source: the NHS, gov.uk and the ONS. Pregnancy content is informational only, not medical advice, and is reviewed by our editorial team against NHS and gov.uk guidance.
How your due date is calculated
Naegele’s rule, the 280-day count, and why a scan can move the date. Informational, not medical advice.
Understanding your fertile window and ovulation
When ovulation happens, the 6-day fertile window, and why cycle length matters. Informational, not medical advice.
UK maternity pay and leave explained
Statutory Maternity Pay, the 39 weeks, who qualifies and how the gov.uk rules work.
How to choose a baby name
A practical method using ONS popularity data, meanings, initials and the sibling-name test.
Names and Family Data Desk, BabyData
BabyData's editorial desk builds and documents the tools, citing the underlying rule and the official UK dataset behind every number. Pregnancy-related tools are editorially reviewed against NHS and gov.uk guidance before publication.
Last reviewed: 12 June 2026