Introducing dog to new baby

Hi, FTM here and owner of a 2 year old Staffordshire bull terrier. I am due on 20/4 and very nervous about introducing dog to baby. Hes always been my baby and I dont want him to get jealous. We’ve tried making changes early on to avoid associating them with the baby. He now sleeps downstairs since finding out I was pregnant and hes not allowed upstairs. He is fine with this. We’ve recently fetched baby swing and bouncer down and he’s scared of them when the music isn’t switched on and is very wary, even nibbled the edges of the bouncer Any advice on helping him prepare? Thanks