The most softest material and no collar keeping in mind baby's soft and sensitive neck! No loose stone work, only embroidery.

Size 12 is 0-3 months
Size 14 is 3-6 months
Size  16 is 6-12 months
Size 18 is 1-2 years
Size 20 is 2-3 years

Men's medium

Father- (medium)-Son -(newborn to 2 years)