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#Second Trimester
Pregnancy Weight Gain: How Much Is Right for You (IOM Targets by BMI)
There is no single right number for pregnancy weight gain — there are four, and the one that applies to you depends on your BMI before you conceived. Here are the IOM 2009 ranges, the weekly rates behind them, the separate twin numbers, and what the evidence actually says about gaining more or less.
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.