Hi mama! PMT usually stands for "Port-Wine Stain" or sometimes "Persistent Mongolian Spot", basically a birthmark na may color, usually pinkish or reddish, na makikita sa face o body ng baby. Hindi siya harmful at maraming babies ang may ganitong marks na naturally fading lang sila over time, pero best to ask your pedia about it directly para sure ka exactly ano yung sa baby mo dahil may different types. A few of us mums have babies with birthmarks and honestly, most of them fade or become lighter as they grow, so don't worry too much!