Big Brother Intuition??

Last night I was reading to Alex his book on being a big brother and talking about the new baby. He didn't seem super interested and kept walking in and out of the room. Then he walked back into the room came over to my belly and said, "Hi Sissy". I asked him what he said. Adam walked in at the same time and heard Alex say again, "Hi Sissy". I don't know if he knows something we don't know, but we'll find out in a few short months!!