It only took three-and-a-half years from USCCB approval to the Vatican thumbs-up, but we now have a Rite for the Blessing of a Child in the Womb. Archbishop Gregory M. Aymond, Divine Worship chair:
We wanted to make this announcement as soon as possible so that parishes might begin to look at how this blessing might be woven into the fabric of parish life. Eventually the new blessing will be included in the Book of Blessings when that text is revised.
Hopefully, people who have wanted such a blessing in the past were able to just ask a cleric, who, of course, would just give it. Still, having a ritual is nice.