I never did understand why the WTS/JW hated celebrating the arrivals of their children.
It seems that it takes a special kind of malice to want to not rejoice, and celebrate the arrival of a child into the world, and then to deliberately ignore reminding them of their value each year.
Back in the eighties I did battle with a JW.
His best reason he gave was because Israel didn't do birthdays, allegedly, and the pagans around them did.
That's some seriously idiotic "theology."
I was always sad that the dude pined to be an Israelite of some sort.
There is no sadder religion than one that pines for the covenant God ended, and fight against the new one He purchased.