The initial prenatal exam to take into account is diagnosing a twin pregnancy. Investigation suggests that nearly 40% of twin pregnancies aren't diagnosed until the 13th week of pregnancy. An ultrasound can identify if twin babies are identical or fraternal. This is known as heteropaternal superfecundation — a standard prevalence https://telebookmarks.com/story10744245/the-2-minute-rule-for-twin-horizon