First of all, it is essential to provide assistance to all infants if they are experiencing difficulties with their development, as neuro-motor problems can have a negative effect on the baby's overall development if the problem is ignored. 
More important is the fact that brain research proves that movement provides a form of stimulation which allows the brain to develop more neural connections, and agrees that early movement experiences are critical to optimal brain development.  It also found that ‘rich environments produce rich brains’ and that children who lack or receive improper stimulation may be developmentally delayed. 
Movement and physical activity further:
  increases oxygen and blood supply to the brain and thus aids in concentration and learning ability
  improves sleep, mental health & mood
  reduces the risk for diabetes, certain cancers & obesity
  increases general health & longevity
  improves strength, posture & muscle tone
A ‘window of opportunity’ further exists where the brain is more ‘open’ to certain stimulation than at any other time.  If a child misses this opportunity for further brain development, it means that the child needs to work harder in the future to develop his/ her neural networks to its full potential.  The critical period for sensory-motor development is between 0 – 2 years of age.  Logically then, it is vital to provide proper stimulation for infants during this time frame.