The primary objective of marriage is for companionship and not child bearing. Although child bearing is also one of the reasons for getting married but should not be seen as a major reason for marriage. Children are blessing from God. Any marriage that have not been blessed with children the both partners should leave happily believing God for a miracle and never see it as a reason for hatred. With or without children, man love and cherish your partner same also to the woman respect your partner
Couples need to talk what they are up to with their relationship. We've got some DINKWAD partners although these couples might be in both, married and not married terms.
This depends on the talks.
Having a child should be planned because it's not easy to take care of it and it's a life time commitment. As long as the partners are in good terms and enjoying each company with or without a child, it's all about you two as a family.