Any babies with white on gums looks like teeth??

gi

My 4 week old looks like he has teeth coming in I tried cleaning his gums cuz I thought it was milk and it doesn’t go away his nurse (owhich I called her)refuses it’s teeth and I’m just confused he was so fuzzy last night he kept wanting to eat and biting my finger hard , I was born with one tooth so I know it’s possible for him to have them coming in as well .. how do you know if it’s teeth under those gums or something else?