There are many people that want children. But the women can't become pregnant. So many people will go to doctors. The doctors try to help people. The doctors are limited.
We need to remember God but many people forget about him.
If a person desire a child but can't have a child. Then that person needs to pray to the Lord. The Lord forms everyone in the womb of the woman.
God can cause a woman to have a child. I have seen woman prayed to have children then that woman will have four children.
Issac and Rebekah prayed to be blessed by the Lord. The Lord gave a baby to Rebekah.
Issac is in the line of the Messiah. God's promises are true.