Stomach problems due to Formula milk.

Dear doctor, My baby is 4 month old...he is drinking milk through bottle and breast feeding... But recently in every month doctor told is to check routine stool test... In that at every month...report comes out reference range- > 5-6 And consistency - green loose It increases reference range from, 2-3,3-4,4-5 and now 5-6 Doctor told me that this is increasing due to bottle feeding . But I tried to give FORMULA MILK through KATORI AND SPOON But he dint know how to suck through spoon and then he cries alot and go to sleep. Rest everything is normal... urine do 10 times.. weight is also increasing baby is playful and activie...but for bottle feeding what to do???m very much tensed and don't know how to get him habit of giving milk through spoon and katori??? I m giving only 2 times Formula milk... morning N before going to bed at night (120+120ml) rest whole day breastfeeding giving...pls help me out