Diet while breastfeeding

Hi mamas! Nak tanya ada tips tak nak kempiskan perut and kurangkan berat badan? Senang cerita nak dapatkan berat asal la gitu. Huhuhu I fully breastfeed my baby girl (3months22days) Mamas yg ada pengalaman yg berjaya or tips boleh share ye. ? And 1 more thing, green tea boleh ke ambil while breastfeeding? Thanks in advance. Love ?