If the home has room
If there are two rooms in the home (one for the parents and one for the baby), the baby can sleep
in a bassinet next to the parents' bed until the baby is 3 months old.
At that age, the baby can move to his own crib in the other room. This way, if the older baby wakes up at night, he doesn't see the parents . . . And he learns to go back to sleep without needing to interact with the parents.