6 month baby, cups?

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When do you start giving baby cups? I saw at Walmart that the cups are for 6+ months. I’m wondering if this is a thing I should start doing? What do I put in the cup? When do I offer it? My WIC pamphlet says I can offer juice but I feel like it’s so early for juice? He’s just a baby 😢 FTM so I’m clueless.