I am pregnant with my ex who already has two kids 50 % of the time . He has a stable paye job and earns 40 k. He has told me already be begrudges / would begrudge giving me money as it will be spent on me he feels . He dotes on the kids he has and they do a lot of activities etc. I know he doesn’t manage his money well and will claim he can’t afford the recommend child maintenance . Can he dispute the amount / not pay?