Inappropriate Laughter

tierney717

Hoping someone on here can help me.  My almost 6 month old has been laughing at the strangest times. In not my finest moment, I was yelling at my (much) older son for some trouble he got into at school.  My daughter began squealing in delight.  To be honest, I don't think I've ever seen her happier.  It's not the first time I've noticed it.  I dropped sugar all over the kitchen floor one day and let a few indiscretions slip out.  She had a very similar reaction.   I'm just wondering if this is normal?  Has anyone out there noticed similar behavior in their infants? There are some other "social" things that just seem off too, but I'm hoping to ease my paranoia a little.