Girls, hi. My son is 2.6 years old and goes to kindergarten until 12:0…

Girls, hi. My son is 2.6 years old and goes to kindergarten until 12:00, he doesn't eat anything there except bread and water. I give him only breast milk during sleep, but maybe without it he can still fall asleep. When I pick him up from kindergarten, he starts crying, he doesn't want to go to kindergarten in the morning either, he doesn't sleep at kindergarten. Do you think it's worth completely weaning him off breastfeeding now? Or will double stress be kindergarten and breastfeeding taken away?