Girls, good day. Baby is 4 months old, allergic, we're on breastfeedin…

Girls, good day. Baby is 4 months old, allergic, we're on breastfeeding, I follow the diet (excluded sugar and everything where it is in the composition, and allergens), I try to eat diversely, but here's the problem, there's no feeling of fullness after eating, we eat and again want, or we eat and it lasts for maximum an hour, who has encountered something similar?