Originally Posted by
dontknownuthin
It sounds like you have physical custody, and your state allows shared legal custody with visitation. Is that right? Now mind - I'm not a lawyer but I've gone some direct personal experience with divorce (yuck!)
Generally, his time with your child is his time and it's his discretion that will determine who else is around her.
The best way to accomplish your goal is to simply talk to him and tell him, "you know, Tiffany is young and I would like for us both to commit not to have her around people we are dating until those relationships are very serious - like engaged. I don't want a lot of people coming in and out of her life. Would you be ok with not having your girlfriend around when you have her?" If he agrees, you've just coparented in a really impactful way. Make the stress on the idea that you feel it would be hard on your daughter to bond with someone who you, as adults, don't know with any certainty will be around a year from now.
If he's not cooperative with you, you would have to have some genuine reason that the girlfriend's presence around your daughter is inappropriate. For example if you are a non-smoker but the girlfriend smokes and you feel it poses a health risk and sets a bad example; or if the girlfriend has a history of alcohol abuse; or the girlfriend is nasty to your daughter or whatever. You may be able to get the court to issue a restraining order, which will restrain the child's father from exposing her to this person.
Be careful though - if you are just pissy because you don't like her, she broke you guys up, or whatever - just leave it alone. Let your daughter's life in her dad's house be her life in his house and know that you, as her mother, have the lions share of her influences in your hands. She will model herself after you. And if you bring frivolous gripes to the court, you will look pissy and immature and it can hurt you when the big decisions come around, so be careful.