Some of the above tactics seem rather harsh to me and could backfire. Yes, he was wrong to give a card and present to his son but nothing for you. And yes, you were hurt, rightly. But my guess is that he has no idea and would be sad to know how hurt you're feeling.
Just find a quiet, relaxed moment to say, "darling there is something I want to tell you about my birthdays, especially as next year's a big one. I don't think you're fussed about birthdays but I love them. Or at least, I love the cards and presents; it makes me feel special and loved. Christmases too - it's just so nice to have something thoughtful from people I love. We were travelling this year of course but next time could you indulge me on this?"
My mother used to say to Dad at the shops, "It's my birthday next week dear. Pop in there and buy me a card while I look at these shoes." He wrote lovely messages in them.
Bit of a generalisation here but: if a man isn't good at guessing what his wife thinks, he assume she thinks the same as him until she says otherwise.