Transcript
A tweet by Ivanka Trump @ivankatrump saying "I cannot believe that Theodore is eight months old today! Happy birthday little teddy bear!" with an admittedly cute picture of a child smiling. It has a reply from @blacknmild saying "this isn't how birthdays work"
No, no. You see, the time period indicates how often you celebrate. This is why it's perfectly normal for OP to celebrate the baby's every month. (Why are we doing this? Oh, right facepalm)