Hi...., it could be due to developmental delay im the milestones.... Developmental delay is the term given to a child who fails to meet key developmental milestones and falls behind the expected progression in areas of development compared to the other childrens... Children with developmental delay will be developing at a lower level than the other children and may also show differences associated with varying muscle tone and multi-sensory impairments.  Consult your pediatrician they will guide you further...