Among gestational<unk>  arrangements, between 19–33% of gestational surrogates will successfully become pregnant from an embryo transfer. Of these cases, 30–70% will successfully allow the intended parent(s) to become parent(s) of the resulting child. For surrogate pregnancies where only one child is born, the preterm birth rate in<unk>  is marginally lower than babies born from standard IVF (11.5% vs 14%). Babies born from<unk>  also have similar average gestational age as infants born through in vitro fertilization and oocyte donation; approximately weeks. Preterm birth rate was higher for surrogate twin pregnancies compared to single births. There are fewer babies with low birth weight when born through<unk>  compared to those born through in vitro fertilization but both methods have similar rates of birth defects.
Surrogacy
Neglect
Metopism
Thrifty phenotype
Henogamy
Undervirilization
Hypermobility 
Dichromacy