You can put a newborn in a double stroller only if the specific model is designed for infants, which usually means it must feature full-recline seats or bassinet/car-seat attachments. Standard stroller seats are generally unsafe for newborns (under 3–6 months) because they sit too upright, and infants do not yet have the neck strength to support their heads, which can lead to breathing difficulties or spinal issues. In 2026, "Convertible" or "All-in-One" double strollers are the standard for growing families, allowing you to click in an infant car seat on one side while a toddler sits on the other. If the stroller seat can recline to a completely flat, horizontal position, it is suitable for a newborn from birth. Always ensure the 5-point safety harness is securely fastened and that the baby is lying on their back. It is strictly advised not to use "jogging" strollers or standard "upright" double strollers for newborns until they reach at least 6 months of age and have full head and neck control.