How do I do almost my elder dog?

Ok we have a toy poodle which I have posted a question more or less but I also have a terrier and why the poodle is 2 the terrier is 11 well the problem is we won't have to verbs about him hurting the baby when it is born cause he is great around kids the problem is he get protective and won't let anyone he don't know around any kid he just loves kids so much is there any passageway I can train him to back down so when my baby is born I don't have to verbs about the people coming to see the baby he won't bite he will freshly growl and show what teeth he has left he will bite if the child is touch we can't put him external for to long cause he can't take the heat or cold for too long and he can't nick loud nosies cause they scare him so bad he will shift in corner of a room and shake very bad (he be abuse before we got him) and you can't put him contained by a room till the person leaves cause he will cry very loud and when he get out he will run to the child in question and acts similar to a daddy dog checking his baby for wounds.And only the terrier will do this.
Answers:    get him used to everyone. once he realize that the universe isnt out to get him he will realize that people will not hurt him.also make shure you compliment him when he lets people comeclose to things and he will realize that what he is doing is good
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