Elizabeth was the wife of the priest Zechariah and the Mary’s aunt. At this time children were considered a blessing of God. The more children you had the more God had blessed you(Psalm 127:3). To not have children was shameful and it was assumed that God was holding back his blessing from you.
Elizabeth and her husband Zechariah had both faithfully served God all their life, yet she had no children. She was at an age when it was impossible to have children. Then all of a sudden her husband comes home mute, and tells her he will be that way until she gives birth to their son; John. Can you imagine the disbelief that Elizabeth had! That would be the answers to the prayers she had prayed but it was an impossibility.
Elizabeth hid herself from everyone while she waited for God to accomplish what he had promised through the angel Gabriel. Everyone had heard what had happened to Zechariah. The test of a prophet is did the prophecy come true. Everyone would be watching to see if Zechariah was really going to have a child. I imagine that Elizabeth was also worried even when she started showing, because of her age she probably worried about complications. Until she knew that this child was going to be born she did not want to be out where everyone could see her.
Six months into her pregnancy her niece shows up with a miraculous story of her own. Can you imagine the conversations these two ladies had? Both are in the process of a miraculous pregnancy that was foretold by an angel.
Elizabeth does give birth to John, thereby giving Zechariah his voice back.
So why did God bring John into the world in this way? I remind you it has been 400 years since God has spoken to Israel. Almost 2000 years before this there was a woman named Sarah who gave birth at 90 years of age. A birth that was physical impossible and was prophesied by God. I believe Elizabeth was a reminder that God could do the impossible. Everyone should have been expectant of Christ arrival. The Old Testament is all in expectation of Christ. God had the miraculous circumstances of Elizabeth’s pregnancy as a reminder and preparation of what was to come.
In Isaiah 7:14 Isaiah had prophesied that a virgin would give birth to a son that would be God with us. A son called Wonderful, Counselor, Mighty God, Everlasting Father, and Prince of Peace. A son that would have the very government upon his shoulders. I think Elizabeth was God’s way of waking everyone up to what He was about to do.