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Over recent decades, there has been a marked increase in twin pregnancies, primarily due to advancements in fertility treatments. In the past, the use of injectable hormones for IVF and IUI was rare, leading to a lower baseline for multiple pregnancies. Since then, the introduction of techniques such as pre-implantation genetic testing has significantly changed the landscape, resulting in a recent decline in the rates of twin and multiple pregnancies.
Types of Twin Pregnancies
Dr. Crawford categorizes twins into two main types: dizygotic (fraternal) and monozygotic (identical).