It is a little strange, unless the name your DH is picking is in honor of a family member or has some other deeper meaning for him that won't be overshadowed by the fact that the child won't actually be called that.
I don't really care for determining nns ahead of time, but if this is the only way you both end up happy, then go for it.
When I was pg the first time, we really wanted to honor our fathers if we had a boy and name him John Patrick. I really love the name Jack though, so we decided that's what he would always be called. We didn't have a boy, but I say, go for it!
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Re: Thoughts on going by a nickname....
It is a little strange, unless the name your DH is picking is in honor of a family member or has some other deeper meaning for him that won't be overshadowed by the fact that the child won't actually be called that.
I don't really care for determining nns ahead of time, but if this is the only way you both end up happy, then go for it.