StellaZ:
6 weeks is WAY too early to even think about that if you ask me. I'd be nervous to even tell people until 12 weeks....
There isn't any point to registering until someone offers to throw you a shower and you have agreed on a date. Then you can go register and they can include where you register on the invitations if they wish.
Though - same as weddings - that is still considered rather rude. In rules of etiquette, you are really only supposed to tell people IF they ask for ideas. Ah, how times have changed.....
I wouldn't say it's rude at all... people will always get what they want whether it's on any registry or not. :0)
By sending the information it just helps to let people know what types of things you're still needing.
I, for instance, already have TONS of clothes... I don't need any more. So things I put on my registries are things like diapers or bibs... things like that. But, like I said, people will always get what they want to get you/the baby. :0)