Chickens have complex dietary needs.....Balanced nutrition will keep your birds healthy.....Chickens are not able to digest dairy products...The yogurt can go.....Oatmeal no real nutritional value in that for a Chicken...The oatmeal can go.....Table scraps....That can go.......Not diet, they get organic lay crumbles, organic lay scratch and peck snd organic yogurt and oatmeal along with table scraps and free roaming the yard all day...since it only happened twice, not close together I will chock it up to imaturity.
Age appropriate Feed is all they require along with grit and oyster shell...Fresh water at all times........5% daily, if that? is all Chickens should get in snacks....Meaning a Tablespoon per Bird....
I do not think you want to be one of the people starting a thread about either, sour crop. or egg bound hens.......
I am only trying to help you keep your Birds in top health........
Cheers!