How do I start this conversation with my SO?

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I have been sceptical about vaccines for a very long time since seeing first hand the risk that you take when giving them to your child. I am 11 weeks pregnant and I don't want to vaccinate my baby. My SO was vaccinated but my mother didn't vaccinate me on schedule and I didn't receive all of them either. How do I bring this up as lightly as possible? I don't want to start an argument but we haven't touched this topic yet and I'm nervous... Any advice? I'm currently watching the truth about vaccines on YouTube and there's so much information, I'm thinking maybe we watch it together and let him make it his idea??