Oh God fairy
Don't go back to him. Just don't. It's never a one off. Ever. Even if in your entire marriage he only ever hit YOU once, the chances are that he's lost it with past GFs.
He is scared of losing the control over you, not you.
You need to get your head into gear and get a Non-Molestation Order and an Occupation Order so that YOU can live in the house with your child.
Not him.
You don't have a penny to your name so how on earth can you live elsewhere?
You other option is to contact Shelter for emergency housing.
I have a horrible feeling that you still don't believe that you have a reason to leave H for good.
He's very good at sob stories it would appear.
The police need to be involved.
You are putting yourself and in turn your son at risk.
For what? A man who hit you, more than once I'll bet too, with a baby, HIS baby in your arms?
What a coward. As others have said he doesn't hit anyone else does he? His boss, mother, friends.
Pathetic.
You have as much right to be in the house as him. If that's what you want.
If not, you need a Non Molestation Order -
"A non-molestation order is aimed at preventing your partner or ex-partner from using or threatening violence against you or your child, or intimidating, harassing or pestering you, in order to ensure the health, safety and well-being of yourself and your children."
Go and look at WA's website again.