Some appeared without the rounded Peter Pan shape or the siffness of the pounted Eton collar. This style seems most common from abourt 1900 to 1920. HBC has noted this style in America, but is unsure how common it was in other countries. Boys wore this style from about 3 to 8 years of age. Some boys were dressed in smocked collars for formal occasions such as weddings, often serving as ring bearers at weddings.
Smocked collars are large, usually white collars with elaborate embroidery work.
The pictures I have seen have been from weddings beginning about the 1950s. The standard soft collars generally worn by boys today became accepted in the 1920s, replacing the Eton collars commonly worn at the beginning of the century. Over time there have been many inovations worn by both men and boys, such as tabs, pins, and the most enduring, button downs. Some shirt inovations for men have not carried over to boys' shirts collars. The British fasgion of white collars on colored stripped shirts is little seen on boys' shirts.