Is it okay for a preschooler to wet his pants once in a while?

When kids are going thru potty training they are still understanding the tolerance level and how long they can keep it in and when they should tell you when they need to go.. Sometimes while playing, kids forget about such things and this little "accident" might happen, be stern but not angry tell your kid what he or she should do in the future to prevent this and still constantly ask them if they have the urge to pee or poo. The moment you ask them, they will remember.