my chick is 7 days old. she smells like sour milk, i read that this could be a sour crop?? what is this and how would i get rid of it, if it is sour crop? she is acting normal and energetic. she eats chick starter food and drinks spring water. i also took her outside yesterday..if that affects anything. she has been smelling like this for like 4 days, but i didnt think anything of it before until i researched it..