Japanese parents are voicing worries over the perceived disadvantage for children born early in the year. Due to Japan's school enrollment system, which enrolls students based on calendar year, children born earlier in the year can end up in the same class as those nearly a year older. The difference in development and maturity between the children stirs concerns over potential academic and social inequalities.

In Japan, parental concerns about the well-being and fair treatment of their children are taken seriously. The current system, predicated on calendar-year enrollment, is viewed by some as inequitable, leading to intense debates. Parents, educators, and policymakers engage in active discussions on how these perceived disparities can be addressed, possibly by modifying the country's education system.

In the US or EU, age-specific cut-off dates for school enrollment vary, typically around September or October, thus creating less significant age gaps within classes, compared to Japan's system. However, similar discussions about the potential impact of a child's birth date on their academic performance and social development exist.