Yes, the Bible has much to say about motherhood - and the reason is because motherhood is one of God's greatest gifts to the human race. This is why the Bible says, "Honor your father and your mother, as the Lord your God has commanded you" (Deuteronomy 5:16).
Why did God give our mothers to us? Why is motherhood so important to God? One reason, of course, is because our mothers bring us into the world, and they take care of us when we're helpless and cannot take care of ourselves. This is a demanding responsibility (as you will discover!) - but it also will bring you great joy. Learn all you can about taking care of your baby's physical needs; other mothers can help you with this.
But God also gave our mothers to us to comfort and teach us. Both parents have this responsibility - but mothers especially are equipped by God for this task. Children need to learn right from wrong; they also need to learn to be less selfish. The Bible says, "Listen, my son, to your father's instruction and do not forsake your mother's teaching" (Proverbs 1:8).
Most of all, God wants to use you as a mother to point your children to Christ and His love - both by your words and your example. On this Mother's Day, make sure Christ is first in your life. Then ask Him to help you be the mother He wants you to be.