For surrogate pregnancies exactly where only one baby is born, the preterm birth charge in surrogacy is marginally decreased than toddlers born from regular IVF (11.5% vs 14%). Infants born from surrogacy even have similar typical gestational age as infants born by means of in vitro fertilization and oocyte donation; https://ewr1.vultrobjects.com/blissdrive/SouthernCaliforniaSurrogacy/Becoming-A-Surrogate-In-Southern-California.html