Quiverfull is a Christian theological position that sees large families as a blessing from God. It encourages procreation, abstaining from all forms of birth control, natural family planning, and sterilization. Some sources have referred to the Quiverfull position as providentialism, while other sources have simply referred to it as a manifestation of natalism. It is most widespread in the United States but it also has adherents in Canada, Australia, New Zealand, the United Kingdom, and elsewhere. One 2006 estimate put the number of families which subscribe to this philosophy as ranging from "the thousands to the low tens of thousands". History of birth control As birth-control methods advanced during the late 19th and early 20th centuries, many conservative Christian movements issued official statements against their use, citing their incompatibility with biblical beliefs and ideals. In addition, there are those who contend that Quiverfull's "internal growth" model is a manifestation of a broader trend which is reflected in the lifestyles of such groups as Orthodox Jews (particularly Haredi and Hasidic Jews) and certain Christians including Orthodox Calvinists of the Netherlands, traditional Anabaptists (such as Old Order Amish, Old Colony Mennonites, and certain Conservative Mennonites), some traditional Methodists of the conservative holiness movement, and Laestadian Lutherans of Finland. The former may also be a case of a manifestation of a movement of opinion within some ethnic, linguistic, religious, regional, or other identifiable groups whose members have expressed concern about their continued existence for historical or other reasons. Such philosophies and groups are diverse amongst themselves—being found in all segments and sectors of the political spectrum—and they usually represent, to varying extents, the diversity within their group.