Respuesta :
The correct answer is 2 years. By end of second year children are able to purposefully use smiling to communicate positive . At eighteen months, their smiling does not communicate positive emotions but is only directed at their mother and caregivers.
Answer: 6 months
Explanation:
6 months old babies do not have the ability to decide if something is funny or not. However, they do have the ability to smile when they want to show positive emotions. For example, they can make a lovely smile when they look at their mothers or when they are pleased about something. Babies communicate positive emotions with their smiles even before they can walk or speak.