Girls hi, I hope everyone is doing well ? In general, we're already 6…

Girls hi, I hope everyone is doing well ? In general, we're already 6 months along. But my daughter doesn't laugh much :( She rarely laughs but gets tired when you tease her ? And there's a tickle on her))) It's just that usually kids at 4/5 months already laugh all over the place. Is this normal? Is she like that or should I worry? Everything is good in the plan, always great mood and so on.