With the significant increase in the numbers of donor-conceived individuals (38,910 live babies were born in 2005 as a result of 134,260 ART cycles performed at reporting U.S. clinics in 2005, compared with 20,659 babies born as a result of 64,036 ART cycles in 1996), many have questioned the ethics surrounding the technologies and human decisions surrounding donor conception, and there has been plenty of controversy. For example, the term "Snowflake baby" was coined in reference to unused frozen embryos (left over from other couples' attempts to conceive through in vitro fertilization) that have been "adopted" by families. Pro-life advocates tend to support such adoptions.