A spokesperson told E! News, "Jenna and her husband do not know whether they are having a boy or a girl."
The rep added, "They want it to be a surprise."
Much of the couple’s wish list, including a sleep sheep stuffed animal, an infant car seat, and a video baby monitor, has already been purchased.
Bush, an NBC contributor, announced she was expecting on the “Today” show in December. The baby will be the first grandchild for the former president and his wife, Laura.