First time mommy is confused...🤔

Ma

So I found out today that my son father is negative b blood type and my son is b positive..Has anyone ever heard of this? I’m O negative and have the RH negative blood so I’m not sure why he would have positive blood. I was told his should be negative too since both his dad and mine are negative..I’m confused 🤷‍♀️ Any suggestions??

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