Does my child need to know how to read before kindergarten?

Oh boy, this is a scary thought, right? Three of my four kiddos (pictured above) went to public kindergarten, my fourth child has been homeschooled since day one. Do you have a child going into kindergarten? I can remember being worried about my kids being ready. Are they ready academically, socially, and what should they know before going to kindergarten? Uggghhh! The stress!