Procreation

Reproduction (or procreation or breeding) is the biological process by which new individual organisms – "offspring" – are produced from their "parents". Reproduction is a fundamental feature of all known life; each individual organism exists as the result of reproduction. There are two forms of reproduction: asexual and sexual.

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Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 6 months ago

Marriage is a human need for settled life with out tension and peaceful life with out sinful acts. Marriage is the only way of procreation with out which human beings would have diminished.
Sexual need is part of the feelings of most people and marriage (permanent or temporary) fulfills this human need.

Marriage is highly recommended in Islam and some cases it can be obligatory on those who can fall in sinful acts if they are not married.

Wassalam.

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Amina Inloes, Amina Inloes is originally from the US and has a PhD in Islamic Studies from the University of Exeter on Shi'a hadith. She is the program leader for the MA Islamic Studies program at the... Answer updated 1 year ago

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!

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All these statements ( human beings are created from clay, from water, from congealed blood) are absolutely correct. The creation of human being has stages; the clay is one of them, the water is also a stage and semen fluid is from water, while the congealed blood is a stage after the formation of the zygote.

Modern science confirms all these stages as you can see the books of embryology.

Wassalam.