When the time came for Elizabeth to have her child, she gave birth to a son.
In these verses, we have, I. The birth of John Baptist, Luk 1:57. Though he was conceived in the womb by miracle, he continued in the womb according to the ordinary course of nature (so did our Saviour): Elisabeth's full time came, that she should be delivered, and then she brought forth a son.
Commenting on Luke 1:57-66
Now Elisabeth's full time came,.... The nine months, which is the full time of a woman's going with child, were now complete; for in the sixth month of Elisabeth's pregnancy, or when she had been gone six months with child, the angel acquainted Mary with it, and she had stayed about three months with her; but now had left her, to shun the company which...
Now Elisabeth's full time came that she should be delivered; and she brought forth a son. (6) John's birth is accompanied by new miracles.