Results from Ultrasound on twin pregnancy (week 19 and 3 days) through int l surrogacy (surrogate 32 yo, used an egg donor), has us concerned with the growth of Fetus B. (est fetal body weight=196 grams, BDF=45 mm=19 wks 5day, H=165 mm=19 wks 2 day, AC=144 mm=19 wks 5 days, FL=29 mm =19 wks 2 day (Fetus A s est. body weight=294 grams, BDF 44mm=19 wks 3 day, HC=162 mm=19 weeks, AC=144 mm=19 wks 5 day, FL=30 mm=19 wks 2 day) Should we be concerned? Any recommendations you could provide? Thank you.