Sunken fontanelle on 6 week old

Karla
Yesterday my baby's soft spot looked a little sunken. After doing my research online it seems the main cause is dehydration, but he has plenty of pee and poo diapers and his mouth is very mosit. I had an appointment with his doctor this morning but found out on the way there that he hasn't been added to my insurance yet and they couldn't see him. So now my other option is to take him to the children 's hospital. His soft spot seems normal now and he is eating , sleeping and is alert I just don't know if it is worth it to go sit in a waiting room for who knows how long and expose him to germs just for some peace of mind?