No one sleeps likes a baby, and babies generally sleep very well on the road. The rocking, lurching, chugging motions usually knock them right out. Still, having a familiar bed or bed gear reassures infants and small children. For infants, we travel with a small portable crib that can fit under our legs on public transportation, or on our laps. By the time baby is six months, it's time to graduate to a portable crib.
Portable cribs are also very handy for taking to the beach or pool.
A familiar blanket and toy can make all the difference for traveling children. As they get older, they can continue to treasure their favorite blanket. We like child-carrying backpacks for traveling with kids up to 3 years old. The Gerry has an inner sling for younger ones that can be dispensed with as they grow. We've even used the Gerry for very small babies, fitting a receiving blanket around baby for stability.