Ay, green poop sa ganitong edad is usually okay lang, mama! Most of the time it's either from foremilk (if breastfeeding), or sometimes it just means ang digestive system niya is still settling in, a few of my mum friends' babies had green poop around that time din. That said, kung ang bebe mo ay masaya, gaining weight, at normal ang wet diapers, probably hindi issue, pero mas safe na makonsulta mo ang pediatrician mo just to be sure, lalo na kung may ibang signs like excessive fussiness o hindi kumakain ng maayos.