Women, birth, and death in Jewish law and practice
By Rochelle L. Millen

http://books.google.ca/books?id=-68Bc1udefEC&pg=PA26&source=gbs_toc_r&cad=0_0#PPA26,M1
Orthodox Judaism
Contraceptive use is prohibited; except in cases where pregnancy could pose some threat to the life of the mother (p33)
Conservative perspective
Bokser certain cases the
Despite the urges of having large families, there were cases where it was morally correct to limit pregnancy. Another reason - perilous condition facing the communities - for example the holocaust. Overpopulation is no reason to justify the use of contraceptives or other birth control methods
Isaac Klein pg 37
Economic hardships are acceptable reasons to use birth control. Contraceptive use is only prohibited if it goes against the law of “be fertile and increase”. Overpopulation is a concern for Isaac Klein and according to him birth control are authentic methods . Preferred method – the pill

Reformist perspective
Pg38