Medically reviewed by Monique Rainford, MDA twin pregnancy is when there are two fetuses in the uterus at the same time. Twins can be identical, meaning they developed when a single fertilized egg ...

One twin will have a low red blood cell count (be anemic), while the other has a high red blood cell count. TAPS is usually diagnosed on an ultrasound after 26 weeks pregnant, and it results in a ...