hi surendra, First i would like to tell you that there is no condition called zero lactation.. it is to do with the mental stress in the mother and support of the family members.. even at at this point you can consult a good lactation consultant for advice on re lactation.. also coming to the problem in the baby it turns out that many of these formulas are a little difficult to digest compared to mothers milk.. stays in stomach for longer time hence the lack of crying for food.. also top fed babies(anything apart from mothers milk) have high colonization rates of bacteria.. these bacteria can also destroy the enzymes required for digestion present on intestinal membrane.. so the sugars that are passed undigested to lower gut gets acted upon by the bacteria and is converted to acidic products which leads to this intolerance.. my advice to you would be stop using bottles feed the same food in spoon which is more hygienic and less chances of infection.. also you can visit a lactation consultant.. the lactose intolerance your baby has may be a transient one which given some time will recover well.. so baby may need a break from lactose in form of lactose free diet..