Is there a 'Kidtuition'?

My husband is in the Military and was deployed when my son was very young.  My son was born in August, and Matt left when Noah was just 3.5 months old.  (On my birthday I might add.)

We had decided to wait to have more children until Noah was older.  For several reasons, one being that Matt was missing most of Noah's first year and would need time to reintegrate.  Another being that we didn't want children too close together.

Well, if you have read any of my previous posts, you know that this did not work out!  God's plans are always better than ours though!

Matt ended up returning days before Noah's first birthday and apparently within a couple of weeks we were pregnant again. 

Being that Noah was so young, we were not sure how to explain the whole pregnancy or the baby that would eventually be coming home.  We talked often about baby sissy (once we found out it was girl) and how Noah was going to have a sister soon. 

He would smile and laugh and pat my belly.  Of course, we had no idea if it was actually clicking. 

Well, the day came and Jordyn was born.  Noah was staying with my dad during the labor and delivery process.  He came to the hospital shortly after Jordyn had been born. 

Now, this is what blows me away.  He walked into the hospital room and saw Jordyn, walked up to her and said 'Sissy'.  He KNEW immediately. 

How?  I still don't understand.   He was just over 1.5 years old when Jordyn was born.  But he knew, from the first moment that she was his family!  Is this an intuition that he had... 'Kidtuition'?  What do you think?  Has anyone else experienced this?