The baby adapts by learning to protect himself and his possessions. New growth and developmental milestones occur by the end of 9 months. Starting to pull up and cruise holding on with both hands to furniture. Sitting steadily and indefinitely alone. Sitting down after standing.
Index finger begins to lead by pointing, poking, and hooking.
Imitating coughing, hissing, and tongue clicking. Listening to conversations and singing tones. Following simple commands. Uncovering toys that they see someone hide. Retaining a series of ideas in mind.