How far ahead do I send a birthday message?
A week to ten days for kids' parties, two to three weeks for milestone dinners, same-week for casual gatherings. Short enough that nobody forgets, long enough that the reply-by date means something. If notice is under forty-eight hours, say so honestly in the first line.
How do I ask guests to confirm their children?
Put the child's name and age on the reply form and it comes back filled without a follow-up. In chat it is a second question every time; on the page it is one more tap, and the kids' headcount lands in the same list as the grown-ups.
What is the polite way to say no gifts?
Write it warmly in the message and plainly on the page: your presence, nothing more, seriously. Some guests will still bring something; the point of the wording is to remove the obligation, not the affection.
Do I still need a reply button if people can just text me?
Texting back works until roughly the tenth reply, and after that it becomes archaeology. The button is not for the guests, it is for you: answers arrive as a list, and the reminders catch the quiet ones on their own.
Can I reuse a birthday page next year?
Each birthday gets its own page and link, so this year's replies stay separate from next year's. The wording you fought over this year, though, is a perfectly good skeleton to start from next time.