Dec 10 here.
My mama made a big holiday happen for the family a couple weeks later, with most of the activity not happening until the 11th. (In fact we usually put the tree up somewhere during the week of the 20th, several times on Christmas Eve day.)
For my 10th birthday my loving sibs gave me some carefully-selected styrofoam balls and other craft items. I peeked, and found a tag. Use these to make Christmas ornaments. 1
Another year my purchased cake 2 had a decorated tree on it.
I endured several "joint" gifts "since Christmas is so close." Hey, I want MY OWN birthday! Dec 25th is a repurposed Pagan construct...aw heck, go look it up.
Years too late I discovered the "half birthday" concept. This is where you honor your deprived offspring with a wacky party in June; a half-shaped cake, an outdoor party, fun "half" theme ideas. Little kids track their ages in months, so this fits right in.
More recently I've fielded oddball queries. "Should I send your birthday stuff now, or do you want to wait until you arrive for Christmas?" Gee, what do you think? How about we celebrate your early Feb anniversary on Mardi Gras since it'll be more convenient?!?
This year I'm playing a band concert on the 11th, and likely going to the local community theatre on the 10th. It's a Wonderful Life is a live musical, I have never seen all of the movie ("I wanna watch football"), and it seems like a fitting, somewhat schizzo thing to do...just like a December b-day.
Detroit suppliers, RIP:
1 Frank's Nursery & Crafts
2 Awrey's bakery, with the chopped nuts on the outsides of the cake