I would not cut out a whole group of friends unless they were a bunch of bitches and not really your friends in the first place. I really disagree with all this cut them out and move on stuff. Is there one person who is particularly like this? Can you talk with them about it? Is there any truth that you have dropped them lately (there's a difference between having different priorities and having just no time whatsoever for friends)?
There are so many people on MN who, having moved on and cut off their friends, are lonely and find it hard to make new ones. I wouldn't take any crap off them, but equally, their circumstances may change, they might have children or settle down and see that actually, your behaviour makes sense and that they were being a little unfair. Secondly, what makes you think a new gang of women friends won't be the same? There's plenty of threads on here about disappointment with mummy friends/not having much in common.
I also think you need to be wary of ditching the 'old Romy' quite so suddenly. In those first few years of full on child-rearing with toddlers and screaming babies, you can feel like you've lost yourself a bit, and perhaps your friends feel they've lost you too. But this changes, you can't sit in with your family forever (or at least most people do like to have a social life external to their family) and you may want to go out, not in the same way, but as you all grow up and mature. YOur mummy identity may be at the fore now, but you are not just a mummy, are you?
None of this applies if they are a bunch of bitches, but if there are salvageable friendships in there, and it's really only the odd remark and perhaps a little of your projection (do you feel like the 'boring Romy' or do they actually say this to you) then I would stay friends, or at least, not delete their numbers just yet.