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#First Trimester
Caffeine During Pregnancy: How Much Is Safe? (The 200 mg Rule)
Almost every guideline lands on the same ceiling: under 200 mg of caffeine a day in pregnancy. Here's what that is in real mugs, cans and squares of chocolate — and how strong the evidence behind the number really is.
Di/Di, Mo/Di and Mo/Mo Twins: What Chorionicity Means for Your Pregnancy
Di/di twins have two placentas and two sacs, mo/di share a placenta, mo/mo share both. Here is how the 11-14 week scan tells them apart with the lambda and T sign, what changes in your scan schedule, and how each type shifts the week your babies are likely to arrive.
How Due Date Calculators Work (And Why They're Just Estimates)
Most people who Google "due date calculator" want their EDD in 10 seconds. Here's what's actually happening when you punch in a date — and why your provider's first-trimester ultrasound is the only date that really counts.
The Chinese Gender Predictor: Fun Tradition or Real Science?
The Chinese gender chart turns two numbers — lunar age and lunar conception month — into a boy-or-girl answer. Two large studies say it lands at chance. Here is the real math, and the two tests that actually tell you.
Twin Pregnancy Week by Week: What Changes, and When Twins Usually Arrive
Twin pregnancy runs on the same 40-week calendar as a singleton, but almost everything hung off it is different: symptoms arrive earlier, the 11 to 14 week scan sets chorionicity, the scan calendar splits in two after 16 weeks, and more than half of twins are born before 37 weeks.
When Did I Conceive? Reverse Due Date and Conception Date Explained
Subtract 266 days from your estimated due date and you have your most likely conception date. Here is why that number is 266 and not 280, why conception means ovulation rather than the night you remember, and how wide the honest answer really is.
Your Twin Due Date Is Really Week 37: How Twin Due Dates Work
A twin due date is calculated the same way a singleton's is — last period plus 280 days. What changes is the week your team plans delivery for: 37 weeks for twins with a placenta each, 36 for twins sharing one, earlier again for mo/mo twins. Here is where both numbers come from.