Edit: There is a narration that says, "When a believer [in heaven] wants a child, Allah will created him or her without pregnancy or birth in whatever form [his parent] wishes, just as He created Adam." (al-Ihtijaj, 2/130, ascribed to a letter from Imam al-Mahdi (A))
I am not sure what else is mentioned on this subject in our sources (perhaps someone can add something.).
However, possibly they will not want to have children there because often our desire to have children in this world is affected by hormones or society, or the desire to procreate is put into our hearts through divine mechanisms to carry out the plan of God for humanity.
God knows best!