Our 3-month-old wakes up 4 to 6 times a night. Sometimes he's not even hungry - he just wants us to comfort him. How can we get him to sleep through the night?

Patience. You need to start slow and allow time for the baby to adapt. Sleeping is usually a pattern and it can be taught. For example, making sure that baby is put to sleep everyday around the same time so that they know that it is a routine. Some babies fall asleep whenever mummy holds them. It is the comfort level of the baby. Usually formula fed babies are easier as we will give them a bottle of milk before sleep time. For breastfed baby, you can only ensure that they had drank their milk before sleeping but high tendency is that they will be awake after 3 hrs.