Short, cited guides from the DueDateLab editorial desk
Every article on DueDateLab is written to answer one clear question, sourced to primary medical literature or a major health body, and kept short enough to read in under five minutes. Use them as companions to our calculators.
LMP-based dating, the 280-day rule, when ultrasound overrides, and why your OB uses one date even if you know the other.
What happens in weeks 1 to 13, the tests and ultrasounds to expect, common symptoms, and when to call your OB.
Two large studies put the Chinese gender chart at chance. Here is the data and what to use when you actually want to know.
What a regression really is, when to expect each one, how long it lasts, and what actually helps at each stage.
How to read percentile charts, why the trend matters more than any single number, and when a change is worth a call to your pediatrician.