Finn's Earliest Memory

Hey Finn Fans,
Finn was in the bath last night, lying on his back with his ears submerged and me holding the back of his head up. I was talking and singing to him and playing with his hair made all swirley in the water. When he sat up I said, "Finn, could you hear me like that?", wondering if he could hear me while his ears were submerged. He nodded yes and then said, "[It] was like when I was in mommy's tummy". !! I said, "It was like when you were in my tummy?", he said "yes"...and I believe him! While we had talked a bunch about when he "was a tiny baby in mommy's tummy", I had never mentioned anything about him being in water, or floating, or anything to that effect! I wonder if he really got some kind of deja vu feeling hearing me through the water like that...