As someone living in the DC area, I hope I can shed some light on this matter. In the pre-9/11 days, you could simply walk up to monuments, the White House, even the FBI Offices in DC for a tour. Since 9/11, though, advanced ticketing is required for everything, even going up the Washington Monument. Since trips to DC, especially by schools or adult groups, are typically planned some time in advance, it could be 3-6 months (if not more) from when you reserve space until you actually go on the tour.
So let’s look at a couple who is waiting to find out the sex of their 8-month old fetus, due in ta month. They want to book a tour for the White House 4 months from now. Their child will be born then, so they need a separate ticket for the newborn. So, do you force them to wait a month to book, and risk not getting tickets? Or do you let them reserve a space for their newborn, with the assumption the child will be born by the time of the tour?
Even 3 months gives you some time, but assume they are trying to do the tour 2 weeks after the baby is born. That is definitely to short of a time to reserve tour tickets. So how do you reserve a space for a human being that isn’t born yet? You provide generic information (i.e. family last name) until the baby is born, at which time you fill in the specifics (sex, DOB, etc).
I understand the interesting nature of the article given the view of pre-born children by the Obama administration. And regardless of whether it is the NPS or White House Staff, all this means is that they are reserving a space for a human who isn’t born yet, and unfortunately, that doesn’t provide any recognition to a fetus as a human being.