About the age of one, a baby develops self-awareness. He/she can recognise themselves in a mirror and in photos. He/she likes to monopolise attention and gets jealous when affection is shown to others.
Between 12 and 18 months, a baby's vocabulary increases by a few words and understands simple things: no, give, well done, goodbye, etc.
From 18 months on, a baby will develop strong emotions that he/she increasingly expresses, such as fear, anger and joy. He/she is attached to people but also to objects. This is when they can be calmed more easily.
He/she also starts to put 2 or 3 words together to express ideas. He/she starts to understands nuances between opposites: top/bottom, large/small, etc.
After 2 years, your child reacts to the feelings of others and can show empathy. He/she needs approval and encouragement from others.
It is only after the age of 3 when they really start to say complete sentences. He/she can count and can say their name and age.