My bb is drinking 160ml each feed. Realise that in the morning, she drinks lesser like 120ml. Is it normal? They are like adults - morning not much appetite so they drink lesser?

I think different babies have different feeding patterns. As long as they are growing well and getting enough nutrients for growth, it should be fine. You can try looking at the total amount that she is drinking in a day rather than for each feed. Would be a better indication of how much she is having.