If the teeth are not protruding all the way fully.. it is normal for them to appear transparent.. I have a baby and when her teeth began to come in they appeared clear like as you mentioned.. I had her checked and her doc said she is fine.. no worries.. now that her teeth have grown out more they are taking the appearance of white color teeth.. not so transparent as before.. no worries.. you are feeding your baby and she is receiving formula which has the nutrients she needs.. daily vitamins is good too.. check with your pediatrician.. overall it is normal hun..no worries