3 Month plus LO kept crying at night

Help! LO is now 3 month plus. He has been crying very hard from 8pm to 12am. I will feed him FM every 2hr with 150ml but at night he seems to be asking for more and refusing to sleep. He used to sleep from 830pm throughout till morning. But lately he been sleeping from 12am till morning. Offered pacifier but it's not working. Had to keep pat n carry him to sleep and it's always till 12am b4 he finally fall sleep. Else he will always wake up in between 8pm to 12am. He seems to be asking for food. However it's abit weird to kept asking more during the night feeding. I am not sure how much more ml I can provide. I have gave 150ml and another 150ml in an hour time.