As a general guideline, when your baby can hold his/her head up, he/she can ride in a jogger. But, we suggest that you follow your own stroller manufacturer’s guidelines. You can use a head roll and bolster to make your baby even more secure. With shock absorbers and recline features, the age can be quite young. As long as your kiddo will safely sit strapped in the stroller, your child is the right age for a Stroller Fitness class.