By cutting back on the powder, your vet may have meant making the milk mixture a little more dilute. She needs more liquid if she is having diarrhea, and we frequently do this with older kittens. In nature, mother's milk changes with the kittens' needs, so it doesn't have to be as concentrated as it does for a newborn. Another thing I have found helpful is adding a little goat's milk to the formula mixture. You can get goat's milk in a quart at most supermarkets either in the dairy section or the health food section if it has one. You can also find it in cans in the condensed milk section, usually on the baking aisle. The condensed is twice normal concentration so you should dilute it down by half. Your kitten's diarrhea may have nothing to do with the formula, but if it does, goat's milk seems to help them firm up.
As for the nipple on the bottle, usually bottles come with some extra nipples. I have had the best luck using a new single-edge razor (carpenter's razor) and cutting a tiny "X" in the tip of the nipple. It should be big enough so that when you squeeze the bottle, one drop at a time comes out easily but it doesn't squirt all over. If you put the mixed formula through a fine strainer, mashing it with a spoon, you will avoid little chunks that clog the nipple. I strain it into a small jelly jar before using a tiny funnel to put it in the bottle.
As for the nipple on the bottle, usually bottles come with some extra nipples. I have had the best luck using a new single-edge razor (carpenter's razor) and cutting a tiny "X" in the tip of the nipple. It should be big enough so that when you squeeze the bottle, one drop at a time comes out easily but it doesn't squirt all over. If you put the mixed formula through a fine strainer, mashing it with a spoon, you will avoid little chunks that clog the nipple. I strain it into a small jelly jar before using a tiny funnel to put it in the bottle.
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