My lo is on formula and he's 4 months and 11 days old, can I start cow's milk in less quantity??

you only can give cow milk once your LO turns 1 year old as their digestive system is not matured yet they may not be able to accept the milk and may even have some intolerance to it. Continue with formula first or breastfeeding. Once they hit 1 years old, you can give cow's milk or even goat;s milk