<human>: Can you condense the text into three sentences or less?

The biggest thing that scares me is the idea of splitting custody of our children [15 months + I am 18 weeks pregnant]. I am the default parent, and the default adult in our relationship. For the first  year of our eldests life I did basically everything. Every nappy, every feeding (EBF), every outfit change, everything. Recently he has finally started changing a few nappies here and there and helping in small ways but its not heaps, and he often seems to resent doing it. 

He gets grumpy very easily while solo parenting, and while he has never taken it out on anyone physically, it doesn't leave him a very nice person to be around while he's in a mood. I basically don't feel comfortable with the idea of him having custody away from me at this stage because of how he acts when I see him or hear  of him talk of his times solo parenting. I am only just feeling comfortable with the idea of my eldest having overnights away from me now,  and worry about how soon they would press for him to be able to take belly bub, who I also plan to EBF.

I also don't want to kick him out, because the only place he has to easily go is unsuitable for children and is very far from his work. However I don't feel like it would be fair for my son and I to pack everything up and try and move in with my parents who have less space.

I am financially dependent on him but I know our welfare system will be able to help me if I can get past the stand down weeks after a potential split - I think it takes about a month from what I've heard, but I am hopeful my parents  would be able to help. Splitting our stuff would be uncomfortable, but ultimately doable. It's really just the idea of the initial transition and not having full custody of my children that scares me, even though I wouldn't want to be one of those  mums that keeps kids from their Dad's.
<bot>: I'm scared of the breaking up process and not having full custody of my children, which is majorly influenced by my partners lack of willingness to parent so far in our first child's life.