One young-child-parenting trick that has worked well for us is white noise. It might be because it emulates in-the-womb-noises, drowns out other noises, or gives baby something to fixate on - but it often does a great job of calming him to sleep. Nearly a year old now, he thankfully doesn’t usually need it for night sleeps, but it’s helpful for a “cranky-because-tired” nap or getting him to sleep for another half-hour when he decides to wake up very early.