Once fertility treatments are completed, many embryos remain frozen, a byproduct of women's treatment options, which include the possibility of preserving eggs if regular therapies fail. The logic behind this is for patients to be able to have children, even if through in-vitro fertilization. But most women have no plans for their embryos once their treatment is complete. 

Fertility patients who are done having children feel responsible for the stored, frozen embryos left over from their treatment, yet more than half are against implanting the embryos in anyone else, according to a new study.

In a finding that could boost the success rate of in vitro fertilization (IVF), researchers report development of a tiny "lab on a chip" to evaluate the fitness of embryos harvested for transfer.

Low-birth-weight children appear to be at higher risk for psychiatric disturbances from childhood through high school than normal-birth-weight children, according to a new report. In addition, low-birth-weight children from urban communities may be more likely to have attention problems than suburban low-birth-weight children.

The majority of infertility patients are in favor of using left-over embryos for stem cell research and would also support selling left-over embryos to other couples, according to a recent survey.

Though unconscious and underdeveloped, red-eyed treefrog embryos can rotate inside their eggs to get more oxygen if levels start to drop, prolonging chances for survival, a new study shows.

Scientists were given green light by the Australian government, in order to obtain embryonic stem cells out of cloned human embryos. The license and 7.200 human eggs were granted to Sydney IVF, an in vitro fertilization company. 

Red-eyed treefrog embryos react to environmental oxygen concentration before they have blood or muscular movement. These initial responses to the environment may be critical to the frogs' long-term survival.

A world-first: birth of a white rhino after artificial insemination with frozen sperm. The rhino baby, a male, was born at 4:57am in the Budapest Zoo on the 22nd of October 2008. In June 2007, scientists from the Leibniz Institute for Zoo and Wildlife Research in Berlin artificially inseminated his mother, the rhino cow Lulu, with frozen bull semen.

Two black-footed ferrets at the Smithsonian's National Zoo have each given birth to a kit that was sired by males who died in 1999 and 2000. These endangered ferrets were artificially inseminated in May with frozen semen from the two deceased males, each giving birth on June 20 and 21 respectively. Successful inseminations with frozen semen are extremely rare -- until now only three black-footed ferret kits have been born from this method.