Contemporary poskim do not agree with this ruling, however. There is a dispute among earlier poskim if one who merely chews meat but does not swallow it must wait six hours before eating dairy. Infants till age 3 do not need to wait at all between meat and dairy. If one forgot that he is fleischig and makes a brachah rishonah over a dairy item within six hours of eating meat, he should eat a miniscule amount of the dairy item so that his brachah is not lvatalah. 3 Hard cheese has the same rules as meat - that means that if one ate hard cheese he may not eat meat for six hours.
Hard cheese is defined as any cheese which is over six months old.
4 Sfaradic Jews are required to wait six hours between meat and dairy. 10 Ruling of Harav Aharon Kotler, as repeated by his family and talmidim. Practical Guide to Halachah vol. 16 Rinsing means to wash out the mouth with water or to take a drink of water or any other beverage. Chochmas Adam and Aruch Hashulchan also do not mention that hatoras nedorim is required.