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 where medical claims are made, and kept concise. Use them as companions to our calculators.
Light spotting around the time a period would be expected. What it can look like, when to test, and when pregnancy bleeding needs urgent care.
Light mid-cycle bleeding can happen for some people. What it can look like, how it compares to implantation bleeding, and when to talk to a clinician.
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.
How infant sleep architecture matures, what triggers temporary disruptions, and which strategies are supported by research.
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.
The 4-month change is a real developmental event. What infant sleep architecture actually looks like, what helps, and what is not supported by primary sources.
Separation anxiety in the second half of the first year, what the AAP actually recommends, and where popular advice runs ahead of the evidence.
Pew Research birth-year ranges for Silent Generation through Gen Z, McCrindle-sourced dates for Alpha and Beta, and a short naming-trend snapshot per generation.