18 month old laughs for no reason?

So my daughter is almost 18 months old in a few days, she always laughs when nothing happens. for example when she is eating in her high chair she will stop, Stare and bust out laughing when nothing is there. Also when she wakes up in the morning she will do the same thing. The first thing that came to my mind was ghosts :rofl::rofl::rofl: does anyone else’s kids do this???

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I was told that I used to do this as a baby and toddler sometimes. I don’t remember why :smiley: