Usually it is not harmful. But in rare cases it may cause the following
- Children do not use their core muscles much which may lead to weaker shoulder and wrist & may eventually affect fine motor development.
- Children with w position have decreased trunk rotation between right and left and may lead to decrease bilateral coordination
- It may lead to some postural problem and results in back pain in long run
- Constant W sitting may lead to In toeing gait/ Pigeon gait due to inner side muscle weakness in long run