Universal Credit: Do payments stop if you do not go back to work after maternity leave?

Hi all, i am currently expecting my third child (first son is 20 and second son is 16) and my partner is physically disabled. I was wondering if anybody had any experience of Universal Credit payments if I was not to return back to work straight after my maternity leave ends? I currently work full time but, we are not sure how my partner is going to physically cope with our new arrival. Thank you in advance.