Do Juvenile Hairs Miniaturize Before Falling Out?

When a hairline is maturing, do those hairs in the juvenile area experience miniaturization before falling out? In other words, is miniaturization a certain sign of male pattern baldness, or only if it is occurring beyond the juvenile hairline?

Most of the time I have seen changes in the juvenile hairline, it has occurred without miniaturization, just a slow regression of the leading edge of the hair. With that said: the frontal hairline in every man and women and finer hairs in the first 1/4 inch or so. That appears as miniaturized hair ,so carefully reading of the micoscopic hair must be made taking the degree of normal frontal small hairs are not confused with progressive frontal balind.