Families with children who are close in age may have a hard time determining whether a single-to-double stroller is worth the investment. It will depend on your children’s ages and sizes. For example, if you have a four-year-old child and are expecting a newborn, a single-to-double stroller will work for both children (as long as the weight limit is not exceeded). However, your four-year-old will likely outgrow the stroller seat quickly, so you can convert the stroller back to a single stroller. (No need to purchase another stroller!) Double strollers are also extremely helpful for parents of twins immediately after birth, and until the weight limit is exceeded, which can be anywhere from age four to five.