Deonna Harris said she was pulled aside this week by a yearbook staff member and told her photo would have to be re-taken because the previous shot displayed Harris' pregnant belly.
Kimberly Haney, who is also pregnant and not permitted to show her midsection in the White Cloud High School yearbook, said she "went to the bathroom and cried" upon receiving the news.
Both girls say they are being discriminated against.
White Cloud Public Schools Superintendent Barry Seabrook said allowing the pictures to appear in the yearbook would be contrary to the state's mandate that public schools' sex-education curricula be abstinence-based.
Haney and Harris have decided against shooting new photos that hide their pregnancies.