How to get a 5 month old yorkie ready for new born baby?

hey everyone ! well im 9 months pregnant and i just bought a yorkie that is 5 months old in march he is a very loving dog and is very attached to me and my husband ..the thing is im scared that when the baby comes in 4 weeks that i wont be able to put the baby in his bouncer or walker and that our puppy will be frighten by the crying and try to hurt my son is there anything i can do to get him ready for the new addition to our family? and how do i stop him from doing lil things like jumping on the couch and get him prepared to not be jealous of the baby but instead protect and love him :)