my son age is 5 years.he is late talker.stydywise he is ok.niw his talking is ok but not fluent.He understands most of our instructions and follow.But as a mother I feel his understanding level is not as per his age for example if you spoil others things it will be a problem.How to make him understand while outside they should be cautious and be careful.By what age we can expect him to understand all this things .