Medical disclaimer
The calculators and articles on Usratak are for general information. They do not diagnose, treat or replace professional care.
Estimates only
Due dates, fertile windows, corrected ages and milestone ranges are estimates based on averages. Every pregnancy and every baby is different. Your doctor can confirm dates, for example with an ultrasound.
Who writes this site
Pages are written by the Usratak editorial team from published sources that are named on each page. The team is not a medical practice and the pages are not reviewed by a physician, so please check anything that matters to you with your own doctor.
Talk to your doctor
Ask your doctor, midwife or pediatrician about your own care, tests, vaccines, medicines and feeding. If what you read here differs from their advice, follow theirs. Do not delay or ignore medical advice because of something you read on this site.
When to get help right away
Contact your doctor or emergency services immediately if you have heavy bleeding, severe pain, a baby who moves much less than usual, fever, difficulty breathing, or any symptom that worries you. Do not wait to use a calculator.
Our sources
We rely on published sources, mainly the World Health Organization, and name them on each page. Read how each calculator works on the Methods and sources page.