Hey, it works! From Jonah Lisa:
Okay, this is another great hack for busy parents. It's also a little cultural exchange of sorts.
My husband's family brought this back to states with them from Holland, where it's not a hack, it's simply a cultural norm. They use what's called a Verjaardagkalender (Birthday Calendar). It's your typical perpetual birthday calendar but the Dutch keep it displayed in the bathroom–right next to the toilet! A little strange? Yes. Super convenient? Absolutely!
Every time you sit down you have a look at what's coming up. Some people even place theirs in the powder room with a pen attached and guests are expected to write in their birthdays while (well let's think before or after, shall we) making a….visit. As a busy Mom who is horrible with birthdays, this little Dutch treat has been indispensable for me.
If you'd like to read more, check out Jonah Lisa's blog post on the topic.