My friend's 9yo came down with them today. Yep, he was vaxed. Well, my dd was vaxed too (before I knew better). I'm thinking about trying for a pox party. I'm only worried that my almost 9mo might be too little. I don't want to expose him too soon. He's not vaxed. Breastfed but also supplemented with formula due to chronic low supply. What else should I consider before setting something up?