I have a daughter whose bday is December 26. We always separate her bday completely from Christmas. No Christmas paper, nothing related to Christmas.
However, I don't see how it is that big of a deal having kids whose birthdays are that close to Christmas. I guess I'm not one who worries about that kind of thing, re:parties and such, just as long as I have that baby.
And really, there's no guarantee that you'd get pregnant just right off the bat anyway....my date of conception was estimated to be 3/15, and my baby was born at the end of December..so.......
If you want the baby, the important thing is getting pregnant with and giving birth to a healthy, happy little one......I'm not sure that I understand the desire to "schedule", as it may be, when your baby is born. Most people that I know are just happy to GET pregnant, and aren't really worried about all that other stuff.
This is JMHO, of course.