7 day old baby boer has runny poop. Feeding replacer given by the farmer 4x a day 4 oz. Contacted local farm supply in a panic looking for advice. Giving scour-chek 2 pumps 2x per day. Baby seems to be growing although his legs seem weak-- concerned he may have selenium deficiency. I know only what I have read on Google. Please help me and this baby. Farmer wasn't capable of bottle feeding and I didn't want him to die. Thank you all so much in advance!!