1. Arthrogryposis: It is a general condition where the movement of joints in children is limited. It is also known as arthrogryposis multiplex congenita (AMC). It causes stiffness of joints. Such joints are unable to move over time. The main cause of this condition is inadequate amniotic fluid. Symptoms include muscle contractures, muscle weakness, and spine curvature.

2. Cerebral palsy: It is a condition in which movement and muscle tone in children are affected. It is caused when there is an abnormal development or damage to the areas in the brain that control motor function. It is the most common disorder that occurs in infants and children. It is also caused due to several kinds of injuries that can damage parts of the brain. It is often not diagnosed until the age of 2 or 3. Head injuries, infections of the brain, decreased oxygen flow to the brain, malnutrition, and heavy metal injections are some of the causes of this condition. Symptoms include exaggerated reflexes, floppiness in limbs, spasticity, stiffening of trunk, arm and legs, and vision or hearing problems. Based on the part of the body affected, it is classified into three types:

Spastic diplegia: It is a condition more likely to affect infants born preterm. It more often affects the legs than the arms.
Spastic quadriplegia: It is a condition more likely to affect babies after delivery. It affects all four limbs.
Spastic hemiplegia: It is a condition that occurs in children where one whole side of the body is affected.