Why is it that all barren women in the Bible who conceived by the grace of God always produces a son never a daughter?

Answer 1

This is because it is God who prevents women having children, who are the gift of God, and inheritance was passed on through sons (sorry, girls!):-

Children are a gift of God:-

Psa 127:3 Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.

Inheritance was only passed on through the sons, and the first-born son was to receive a double portion of the inheritance:-

It is God who prevents women having children:-

1Sa 1:2, 5 KJV [v. 2] [Elkanah] had two wives; ... Hannah, and ... Peninnah: and Peninnah had children, but Hannah had no children... [v.5]..[Elkanah] loved Hannah: but the LORD had shut up her womb.

Gen 30:1-2 NET When Rachel saw that she could not give Jacob children, she became jealous of her sister. She said to Jacob, "Give me children or I'll die!" [v. 2] Jacob became furious with Rachel and exclaimed, "Am I in the place of God, who has kept you from having children?"

Children are a gift of God:-

Psa 127:3 Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.

Inheritance was only passed on through the sons, and the first-born son was to receive a double portion of the inheritance:-

Deu 21:17 But he shall acknowledge the son of the hated for the firstborn, by giving him a double portion of all that he hath: for he is the beginning of his strength; the right of the firstborn is his.