Milk intake at 12 weeks

My baby is 4.8kg at 12w. Previously was fully latching baby but due to period my supply have dropped half and baby went on nursing strike. Now i have change to bottle feeding and feeding baby 90ml each for 7 feeds. Baby is only 630ml per day however recommended amt is 720ml. Baby cant finish bottle when i try to increase to 100ml per feed. Is it normal? Am i underfeeding baby? #adviceplease