How much. Oz topfeed I give to my one month baby boy?

Varies. The average infant will consume 1/2 his/her weight (lb) as ounces per feed. (8lb=4oz,10lb=5oz) and feed 6-8 times per day. Most 1 mo will be at between 20-24 oz total, but there is wide variation based on actual size. The 8 lb one month old consumes less than a 12 lb 1mo.