Help! I've been breastfeeding my DS with no problems for 3 months. Yesterday I suddenly felt very sore when he latched on my left breast. Same pain as when latch on was wrong at the beginning. However he is latching in perfect. I have now noticed a white mark on my nipple (not a spot). DS also is fussy when feeding and often kicks a lot until he eventually pulls off cryibg after 5 minutes . Could I have nipple thrush?