No. 20: Do "The Pause"
"We know that babies often cry when they're learning to connect their sleep cycles. We also know that they can make a noise like an angry frog and yet still be asleep. So from the time the baby is a few weeks old, pause a bit when he cries at night. You are waiting to see if, this time, your baby will have a breakthrough moment and plunge into the next cycle on his own, without anyone's help. If you immediately rush in and pick him up, he won't have a chance to develop this skill."