As if the first day of school isn't already a nerve-wracking experience for kids, try doing it with one of these hairdos.

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Tan Chaoyun from Shenzhen, China, realized she had a problem when her 6-year-old quadruplet sons were about to start school and are so identical that neither she nor her husband can tell them apart.

Chaoyun was worried the boys' similar identities could cause problems for their elementary school teachers, so she came up with a quick-fix solution as simple as 1, 2, 3 and 4.

She had a barber shave the numbers onto her son's heads.

"My sons are identical, even to me," Tan told local reporters. "I could only tell the difference between them by having different ankle tags on them before they turned 18 months old."

"Even now, their father can't tell which one is which. Sometimes, he punishes the second one for something the third one has done."

As far as their father is concerned, Jiang Yunglong, Jiang Yun-Shao, Jiang Yunhan and Jiang Yunlin might need to take more drastic steps than just their numerical knobs to differentiate themselves from one another.