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The first sign may be that the baby is unsettled, especially when feeding (his mouth is sore). However, many babies are not bothered by thrush.
Thrush shows as white patches on the roof of the mouth, inside the cheeks and on the tongue. There may be redness around the patches, and they might look like ulcers. Unlike bits of milk, the patches do not wash or rub off easily.
Sometimes the baby will have a nappy rash which may also have thrush in it.
You can treat it with Daktarin gel if it is thrush, it's an over the counter product at the chemist. Also, how are you sterilising his bottles and dummy? If you use Miltons solution, stop using it for a while and boil all his things. Miltons doesn't kill the thrush bacteria.