Your sweet only child is about to become a big sister and you're faced with the excitement of how to tell the family. This front and back design t-shirt is a funny spin on our popular "only child" shirt and will be a great way to spread the news! The front features the message, "only child" ... and then big sister to be turns around and the secret is revealed... "until any month/year!". This t-shirt is completely customizable with whatever month/year date you need! Perfect for pregnancy announcements, new big sister to be gifts and more! The best part is sitting back and watching everyone figure out what the shirt means! Just add your custom requests to the "Special Instructions / Notes" section when ordering. This digitally printed t-shirt means that the fibers of the shirt are actually dyed with eco-friendly water based inks and is printed on a superior quality, super soft t-shirt for long lasting durability.