MC twins by definition are MZ, while discordant sex twins are DZ. In the remaining 50%, zygosity cannot be determined without DNA fingerprinting, which is rarely indicated in utero. Zygosity studies on cord blood are no longer offered routinely, as the babies can be tested any time in childhood. Not only are parents often curious, but knowledge of zygosity influences the twins rearing, sense of identity, genetic risk and their transplantation compatibility. Rarely there may be indications for zygosity testing in utero on invasively collected fetal tissue, such as deducing genetic risk or excluding contamination at prenatal diagnosis or demonstrating dichorionicity in the presence of fetal compromise.
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Once your pregnancy is over and done with, your baby is happily in your arms, and youre headed back home from the hospital, youll begin to realize that things have only just begun. Over the next few days, weeks, and months, youre going to increasingly notice that your entire life has changed in more ways than you could ever imagine.