what the hell trixie has period when she's only 6 mons

Hello Again!!today i went to my cousin house and suddenly somebody called my cousin house.then my sister said "SARAH SARAH "trixie have period !!!So i was like !!OMG!!soi said ok i go home now but my sister said its ok i'll ask mummy to do it (haha).so after when i went home i help to wash the floor too(sob*)then after a few days when it was night time we fed her and she vomited all out so i wonder weather is she sick??and her period was like keep driping ?? i wonder why i'm scad if she's sick...so her period was like 1 week??