Jehovah's Witnesses, why no birthdays?

ok holidays I can sort of understand, especially halloween. I disagree entirely but I understand. But birthdays? seriously? there's something wrong with considering the anniversary of a loved ones birth a reason to celebrate? what's with that?
Update: We never see Jesus have a family either but it isn't wrong to do that...
Update 2: @Escape: what attitudes are you talking about? Having fun? Getting a family together?
Update 3: They only brought the gifts months late because that's how long it took them to get there
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