Girls, please help, tell me how to stop a one year and four month old …

Girls, please help, tell me how to stop a one year and four month old baby from breastfeeding, it's just unbearable he keeps going for his little bum, I can't even go to the toilet, there is not a single moment left, nobody goes anywhere, my head is about to explode?he eats everything we eat, but at night he needs a breastfeed and wakes up frequently because of this.