The breeder I purchased Ezekiel from told me up front he had an open fontanel, and that in most, not all, cases it will close. When I took him to the vet, he, of course, noticed
and said it may or may not close. By his second visit 1 month later, it had closed some. The vet said be careful and he'll do just fine. (be careful the vet says!! Ezekiel is a pistol!)