Need help-child care

Hi this is padma,My son started his preschool from last weak,when I drop off in school he started crying,he is not eating lunch,his school starts at 8 o'clock to 3pm.obviously he has to take break fast at 7:30 am.His teacher said he was crying continously throughout the day & saying "wants his mommie".He is very attached to me,I feel that this "attachment style" may have a lot to do with his emotional readiness to start school.