Does your sweetheart have a big secret? Is she about to be a big sister and wants to have some fun letting everyone in on the secret? Then this front and back design big sister knock...knock t-shirt is the one for you! The front features the message, "KNOCK...KNOCK... WHO'S THERE?" , then the big sister to be turns around and the secret is revealed... "A new baby brother or sister for me THAT'S WHO! I'M GOING TO BE A BIG SISTER!!" Perfect for a pregnancy announcement, new big sister to be gifts, and more! Sit back and enjoy the fun while family and friends figure out what the shirt says! Everything is completely customizable from hair color and skin tone to wording, to design! 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.