Go to the dr my son was given nystatin first and it helped some then he prescribed him something different and in 2 days its almost gone. His thrush was so bad his whole mouth was white and it was so thick

Nystatin prescription

My pediatrician told me it was okay to use coconut oil in her diaper area and a little bit in her mouth. Try to use a burp cloth or something to wipe his mouth out after he's done eating as well. If it gets bad they should put him on something for it