length of teat isn't really going to tell you anything about age as some babies have fairly long teats when they are born. If the auctioneer made a "big deal" about taking her from her mother, then I would say she is probably pretty young. Do you have her on milk? If she is under 4 months of age (and I bet she is), she should still be getting milk. A regular human baby bottle will work and so will regular whole milk from the store. You might want to make the holes in the nipple a little larger. I would be giving her milk at least three to four times a day. Start with 6 ounces and see how she does. You may have to put the nipple in her mouth and be very patient.
Altho you have had her for a while----make very sure that she is drinking. That is very important for both babies that you have. Sometimes people tend to take them off milk much too early and the babies don't intake enough fluids.
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