Spoiled baby.

Hey guys. I just wanna hear other people's opinions on this. I have a baby boy. 11 month. He is our first baby. He sleeps with us. But in his bed too. Mostly with me. He is a mama baby. Now I love it. How much he love me and wanna be under me. But I'm now pregnant. 8 weeks. And my husband saying I need to ween him off a bit. Mainly in bed because I will have a new baby. I love my son so much. That I can't think about not having him close to me. The new baby will be in the bassinet beside me because I will have a c section. I tried last night to put my son to bed but he won't go in his bed unless he sleep and even then. He woke up and crawled into my room. 🤦🏽‍♀️ so he ended back up in my bed. How do I ween him off? Should I? Anything I need to know in preparing for this next baby?