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#Multiples
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.
Kick Counting With Twins: Why Per-Baby Counts Don't Work
Counting each twin separately sounds more careful, but maternal perception cannot reliably tell twins apart, and one baby's movement can push the other. Here is what to track instead, when to start, and why reduced movement is still an immediate call.
Scans and Tests in a Twin Pregnancy: What's Different
A twin pregnancy is scanned far more often than a singleton one, and the reason sits in a single first-trimester appointment. Here is what each scan is for, why dichorionic and monochorionic twins follow different calendars, how Down's syndrome screening behaves with two babies, and what the glucose tolerance test still cannot 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.
Twin Pregnancy Weight Gain: The IOM Targets by BMI
Twin pregnancy weight gain has its own targets, and they are not the singleton numbers doubled. Here are the IOM 2009 provisional ranges by pre-pregnancy BMI, why there is no range at all for underweight women, when in the pregnancy the gain actually matters, and what the research since 2009 shows about gaining below or above them.
When Are Twins Born? Twin Delivery Timing by Chorionicity (34–38 Weeks)
Planned twin birth falls between 34 and 38 weeks in UK and US guidance, and the exact week depends on chorionicity: UK guidance offers planned birth at 37 weeks for twins with a placenta each, 36 weeks when they share a placenta, and 32 to 33 weeks when they share a sac. Around 6 in 10 twins arrive before 37 weeks regardless.
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.