DS is 6 months and BF on demand. Back to work two days a week from Sunday but they are literally 7am-8pm. How much milk should I leave for him roughly? I know it varies but could do with some advice from people that bottle feed as to how much their LOs might take in a day. Hoping to give him a feed before I go and when I get back. He has started weaning but obviously most of it goes between the floor boards 
TIA.