Boyfriend losing his sh#t ...

Today I was saying to my SO that I think we need to move home before the baby comes. We own a 1 bedroom apartment which is fine for us 2, but we have little room for a baby. I'm worried about it but he isn't, and says we'll manage. I said to him I think he's being unrealistic and he hit the roof saying I don't trust that he can look after us, and I keep on being negative. Then he said something I can't get out of my head...

"Go kill the baby then".

I am heartbroken. I went to the bedroom and cried where he followed me in, pinned me to the bed and tried to tell me it would be ok but he was still yelling at me. After breaking down and telling him to leave me alone he did, and we haven't spoken since. He's text me saying sorry, he didn't mean it and he'll sleep on the sofa. But still says my attitude winds him up.

What am I supposed to do?! I was just trying to make him see my point of view.