My week old Seb gosling let out this white runny poop yesterday. This morning I saw another small poop which still had a good amount of white substance and the Mazuri food she’s been eating. The only things she has had to eat are the Mazuri grower pellets, chick grit started a few days ago, and a little bit of grass and clover from an untreated yard. Is this normal or should I be worried? I’ve been watching her eat and drink, seems okay otherwise. Is there an antibiotic I can get from Tractor Supply to give her just in case?