A bassinet is specifically for infants, usually newborns up to about six months old. Once the baby outgrows the bassinet, it's time to use a crib.
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Temporary Bed
A bassinet is often used as a temporary first sleeping place for a baby, not a permanent one. I set up a bassinet in our room for the first few months after our baby is born.
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Portability
Bassinets are lightweight and often portable, which makes them easy to move around. We have a portable bassinet so we can easily take it with us when visiting grandparents.