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Buying a Single to Double Stroller Families with two kids, of varying ages, will require a stroller that can be changed from a single model to a double. Experts such as Katie Billingsley of Fourth Trimester Postnatal Retreat suggest looking for a stroller that can be used in a variety of seating arrangements. The Mockingbird Single-to-Double Stroller offers all of this functionality and more at a very affordable price. Direct-to-consumer model, the brand avoids markups at the retailer to provide an elegant stroller at less cost. Simple to Use