Birth Control: in Lithuania?

Igros Moshe (E.H. 1:64): This that you heard from one rav that in Lithuania they permitted all women to use birth control for two years after giving birth – that is false. Because I know many rabbis who are extremely strict about this and I have never heard that there are rabbis who automatically permit birth control to the average woman. That is because the basis of the heter of birth control is only for danger. Therefore it is not relevant to state that such things as birth control are governed by the customs of the locale and city. Rather every rav who is great in Torah and thoroughly familiar with the Talmud and the words of the great rabbis – has full rights to judge according to his understanding in every question that comes before him – based on the facts of that particular case. Consequently it is absolutely not relevant to say that there was a general psak in Lithuania for this matter – and therefore your source testified falsely either on purpose or by mistake.