Although the successful births at Kaiser Permanente Medical Center in Bellflower have received worldwide attention, they also have prompted disapproval from some medical ethicists and fertility specialists, who argue that high-number multiple births endanger the mother and also frequently lead to long-term health and developmental problems for the children.
Under the guidelines of the American Society for Reproductive Medicine, U.S. doctors normally would not implant more than two embryos at a time in a woman under the age of 35. After that age it is more difficult to become pregnant. The mother of the octuplets is believed to be 33, based on available public records.
Doctors were surprised by the eighth child, as they only knew about seven of them. Link