When we decide to take a different/new direction in our life, we have a responsiblity to talk to our spouse about it. How and when we communicate is every bit as important as what ever it is that we're communicating about.
No choice here but to take a pause, discuss how both of you feel and make a decision. If either one of you "takes a stand" and simply won't back down, then you both need to have a discussion of how this will affect the way you make other decisions regarding other equally contentious issues.
I hear some advice in this thread that is ill-advised and a sure fire way to tell your wife that you don't respect her as a person. Even if she's action belligerent or illogical, it's no excuse for the other person to and I'm not saying she was or is.
I didn't carry when I got married. When I decided I wanted to carry I owed it to my wife and to myself to share with her BEFORE I did. She didn't care for the idea but after discussing it, we agreed I would even though she still doesn't like the idea. Had she given me an ultimatium I don't know what I would have done but the bigger problem would have been that once you start doing that it gets easier to do and it's a sure fire way to head to divorce so if you feel you have to, you'd better be sure it's such a significant life principle for you that you're willing to let it hurt your marriage as much as it might.
Your situation is different in that she understood you'd carry but not with your Daughter but at the end of the day it's still about carrying albiet under a specific condition.
If I knew that my wife was that upset about it I think I'd stop for a week or two, allow a cooling off period, buy her flowers and then talk about you feel it's important for the two of you to talk about HOW you can go about talking about this touchy subject without it causing anger and I'd smile and touch her hand as I said this (if she'd let me :redface
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What she might be more upset about than anything else is she might feel like you were doing it behind her back. It might be more about trust than about carrying a gun around your daughter.
I hope it works out for you. It took a year or more but now I have a gun on almost all the time when I'm in the house. It's IWB so the whole family sees it all the time. I conceal or remove it if others come over to the house. At first that would have caused too much friction so I either kept the gun concealed or I disarmed at home.
It was all worth it.
I have little respect for opinions that bull headidly say it's your right, just do it period and don't give any consideration to the importants of the relationship with your wife. Won't do you much good to stand your ground and tell the woman what you're going to do if you end up some day not having that woman and little girl. Sound extreme? Well relationships tend to errode over time, one little thing at a time....