Etiquette is the most important thing for your child to learn and he has started showing the same. Now you should get used to listening to words like 'please', 'thank you' and 'sorry' from your child without you even reminding him.
What you need to know:
Earlier, you used to remind your kid to say sorry and thank you whenever it was necessary. Things have changed now and with time he has become accustomed to the situations in which such words of social language should be used appropriately. It is time to appreciate him for being chivalrous and showing manners in front of others.