Do babies remember songs they heard in utero?

I didn’t sing much while I was pregnant.  But I did sing one song all the time.  Twinkle, twinkle, little star.

Since Hannah was born, she has always given me some kind of reaction (lately a huge smile) every time I sing that song.  I even sang it to her while she was on her third IV attempt, and it calmed her down a bit.  No other song except one other one (I love you, yes I do, won’t you say you love me too) gets a reaction from her.

So I wonder, did she remember me singing that to her while I was pregnant with her or does something about that song just make her happy?