As each child's development is different, you should always consult with your pediatrician before using the Orbit Stroller for jogging with your baby.
Subject to your pediatrician's advice, for jogging use, it is generally recommended that your child should be at least 8 months old.
In addition, only use an Orbit Baby seat that is rated for your child's age, weight, and height, and specially approved for usage in the X5 Stroller.