Baha’i Studies Bulletin Vol I #4 March 1983 pp83
"Regarding your question of whether you should have more children or not, the Guardian feels that this is a matter for you and your husband to decide. However, we must always bear in mind that God will protect His own, and that the Baha'i children are the future servants of mankind who will help to carry the world forward into the glorious New Order which Baha'u'llah has prepared for it in this day of days. We should not face the future with fear, but with glad and assured hearts."
(From a letter written on behalf of Shoghi Effendi to an individual and cited in a letter written by the Universal House of Justice dated 31 July, 1970)
re whether you should have more children or not