Delaying having children waiting for hijrah

Question:  

السلام عليكم ورحمة الله وبركاته

Is it allowed for a couple to delay having children until they are able to make hijrah? They don’t want to raise children in Bilaadul Kufr, because it is almost impossible to raise good muslims in these countries. For instance, in some countries there are no Islamic schools and the government have put restrictions on the Muslims.

وعليكم السلام ورحمة الله وبركاته

Shaikh Hassan Al-Banna:     

 Yes, it’s allowed to delay the pregnancy because of this reason