If it’s not going it is possibly thrush. Could check with the dr to see?
@Hope mine got milk stain on his tongue, don’t know how to get rid of it. I used tongue cleaning brush I bought from boots, but no luck.
My baby had a white tongue but it has only just disappeared. He is 17 weeks now x
I have never cleaned my boys mouth, just starting to rub gums to prep for brushing teeth but more for experience than to clean