Twin pregnancies can happen naturally or through IVF. Natural twins occur either when two eggs are fertilised at the same time (fraternal) or when a single fertilised egg splits (identical). IVF twins, on the other hand, usually result from transferring more than one embryo into the uterus during treatment, or occasionally when one embryo splits. IVF gives doctors more control, inc... https://www.ivfsurrogacy.in/ivf-for-twins-cost-in-india/