Is it permissible to limit the number of embryos to one only? Is it permissible to determine the sex of the baby without committing a sin? Is it permissible to be content with a single pregnancy despite having the financial and physical capability?

It is permissible to determine the sex of the fetus if there is a health need for it, or if it is before the formation of the fetus, though it is better to leave it. It is permissible to temporarily prevent pregnancy for a benefit seen by the spouses, whereas permanent prevention of pregnancy is not permissible.