Mommy Knows Everything Kids T-Shirt . Brand New. This is A Unisex Children's T-Shirt. Each shirt is screen printed with the phrase, "Daddy Knows A lot But Mommy Knows Everything" Exclusively yours from Gone Blue.com. Great for gifts for your child's everyday use. This Print comes in a variety of colors to be worn by both young boys or girls. Get your child one today. 100 percent cotton.