A little bit of a rant here so be warned .. thrush (candida) is totally over diagnosed . Any mother that has sore nipples after one week is generally told that she has thrush . In my 5.5 years of being in private practice , seeing hundreds of mothers , I've seen real thrush less than 10 times. A baby with a white tongue does not have thrush - it may have a slight runny nose and be breathing through its mouth.. it may have a tongue tie - where the tongue does not move freely so fluids and secretions such as breastmilk do not wash off easily. Or it may just have a white tongue !
If someone tells you that you have thrush - unless there is white /greyish streaks on the inside of your babys cheeks not on the tongue , they should be checking your latch first. If you have any disortion of nipple shape after feeding - thats whats causing the pain not thrush. Get a IBCLC who is experienced in assessing tongue tie to check your baby. (not all are ...).
Next topic is going to be tongue ties - and I've a big announcement :)