[quote Anteak]@aSofaNearYou Yes I am focusing not just on step mums, but step parents in general.
You can and have every right to be very blase when it comes to your partners children, however when you then decide to have a child you all need to understand what the implications are. The same as parents who have more dc when they have one or two already, most people discuss how and when they'll have children when they should tell said children.
I'm not saying that this is the op, but more often than not the most important things that should be discussed before bringing another child into the world, quite simply aren't and that's when cracks appear in relationships and it then becomes his/her child against mine/our child, resentment steps in and who are the ones that end up losing out?
I have been the ex wife and the stepmother, so I'm not being biased or trying to take the exes side or put down the op as a stepmum. 6[/quote]
In fairness though Anteak, don't you think in this situation that the children will likely face more issues and worries regarding the new baby as soon as their mum finds out, given her track regarding her ex's last major life event (OP's wedding)?
As I said above, if this were me and my DP in OP's shoes, we would definitely put off letting her know for as long as possible for fear of her purposely upsetting the children about it, or messing around with contact, not to mention sending nasty, spiteful messages to a pregnant woman.
If the SCs were teens I'd say OP might have some trouble when they are told, but since they are so young I genuinely don't think they will even consider how it's taken to tell them, they probably won't even know how long OP has been pregnant for, all they will care about is how long to go until the baby comes.