As advised by Babychakra Expert Dr Riddhi(Prenatal) - Has there been any food that You have introduced for the first time in these few days ? It can be that the food has not been digested well . Like an upset tummy . So check on that & if u feel ur baby is passing the similar kind of stool for more than 24 hours , please kindly visit your Paediatrician

vomiting milk is only the excess milk so don't worry. potty usually it does smell bad but if u see anything sticky and frothy in potty only then go to the dr till then all well don't worry.