Our Dr says since our Mono/Di twins are at higher risk for twin-to-twin transfusion syndrome, we get to go in for ultrasounds every 2 weeks, we have been seeing them so much it is amazing! And they have been printing like, 10 pictures every time until this last one at 18 weeks. They gave us 34 pictures, and 10 of them were 3D! The little girls are growing so much!