This is the time when your little one turns into a great mime. He has developed enough to playback, albeit very roughly, the actions he encounters every day. Waving is a complex muscular activity for your toddler. He has to outstretch his flattened palms in the air and this requires tremendous motor coordination.
What you need to know
Waving is also a sign of social and cognitive development as it reflects the fact that he is able to understand temporary disappearances. Teach him how to wave by repeatedly demonstrating the same, and if needed hold his hand and gently wave it for him. He’ll catch up eventually and learn to do this on his own.