We've just been invited to a first birthday party in Somerville, MA,
and the parents said no gifts.

I feel silly going to a child's birthday party and not bringing a gift.
I wouldn't want them coming to my daughter's party and not bringing a
gift, even if I know it's likely to be something I don't want or need.
It's not about me, it's about the child.

What is the practice where you live?