When is an appropriate time to start shopping ?

I'm a FTM and so very anxious about baby, I don't wanna go overboard with shopping 😂 but I'd like to start while I have the money, so that I can get all the important stuff out the way, and the smaller stuff later. When is an appropriate time to start shopping for baby ? I'm still in the first Trimester 
Update: I don't plan on having a baby shower being that I just moved, I don't know anyone yet. 

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