From 12 months on, a baby can walk alone. He/she starts to grab objects and crawls up stairs. He/she says no by shaking its head and starts to hold a spoon alone then its beaker and bottle. He/she can now point at things with its index finger.
About 18 months, a baby can run, sit down, walk backwards and carry large toys. He/she starts to jump, go and get objects and move around with toys on wheels.
About the age of 2, a baby grabs ladders, runs by avoiding obstacles and copies choreography by singing or dancing!