noun, noun which may take the genitive case particle 'no'
born early in the school year; born between Jan 1 and Apr 1
Refers to children born between January 1 and April 1, who are among the youngest in their school grade under the Japanese system where the school year starts in April. Often contrasted with 遅生まれ (おそうまれ), children born later in the year who are older in the same grade.
See also: 遅生まれ
My child was born early in the school year, so they are smaller than other kids in the same grade.
Children born early in the school year tend to show developmental differences compared to those born in April.