My friend had a scan last week and her twin girls, who are fraternal, own sacks and placentas are said to be about 3.2 pounds and 3.7 pounds. Her doctor hasnt said this is a low weight but I'm sure twins are usually around 4 pounds at this gestatio. She is nearly 33 weeks. She is also quite tall so I would have thought they would be bigger. Did anyone have twins that suze at that gestation?