Personalized Pi Day March 14 Math Lover Science Baby Bodysuit. Whether you're attending a math-themed party or just want to express your geeky side, this Pi Day apparel is a must-have. Grab yours today and wear your love for math proudly! Our one piece baby bodysuit make great gift for newborns, babies, infants, baby showers and expectant moms. An ideal gift for any new parent who will want one in every color.