I’m your experience did your ex want more or less time when a new baby came into the picture?

My sons dad is having a baby this fall with his new fiancé, so I’m curious what others experiences are. I know I can’t predict the future for our specific situation, but there’s usually a ballpark route things go. Also anyone who has been through it on either end, any tips for healthy boundaries but also being accommodating to them having a new baby when it comes? Because if it were me I know I’d want to at least have a period of time where things were a little easier on me. Granted when our son was newborn it was literal hell accommodating them, so there’s that.