The half birthday celebration - which includes the usual parties and gift giving - is said to be the latest odd parenting trend.
Celebrated 182.5 days (half a year) after the real anniversary of a child's birth, the parties have become a hit with middle-class families.
And firms cashing in on the trend have even started producing special 'Happy Half Birthday' cakes and cards.
Let us know in the comment section if you're tempted to start celebrating half birthdays -- and if Queen Elizabeth II is reading this (and we know she does) your second birthday doesn't count.
Sonya Trent, from Birmingham, whose six-year-old daughter was recently invited to a half birthday party said: "It is ridiculous, who needs a celebration every six months. The worst part is that the parents expect presents for the kids too.
"While I have no intention of having these stupid celebrations for my daughter, it's hard to tell her se can't go to someone else's party."