The front fontanel and the back fontanel are slightly smaller and the front fontanel is larger.
When the fontanel is normally closed, it will be closed after three months to six months.
The time when the front door is closed is about one and a half years old.
Of course, this time is not absolute. If the child grows and develops normally, his mental state is good, his diet is normal, and he sees more sunshine, it will generally not lead to the big problem of fontanel closure.
As long as the head circumference is normal, don't worry too much about the time when the child's fontanel is closed.