A month ago, all my family got together for the New Years and my cousin who has a year old brought her baby who has been Ferberized. They had a strict sleep schedule, and when it was time for the little one to take a nap or sleep she would just bring him upstairs lay him on the crib and he would toss and turn for a little while but would fall asleep on his own. That NEVER happens to me. I have to either walk around singing to my little one, or she needs to nurse before she can fall asleep. I am sick as a dog from a cold and my 14 months old woke me up 4 times last night to nurse. When I woke up this morning I started thinking should I have sleep trained my baby??

On babycenter Ferber method is described as:

Ferber says you can teach your baby to soothe himself to sleep when he’s physically and emotionally ready, usually sometime between 4 and 6 months of age. He recommends following a warm, loving bedtime routine and then putting your baby in bed awake and leaving him (even if he cries) for gradually longer periods of time. Putting a child to bed awake, says Ferber, is crucial to successfully teaching him to go to sleep on his own.

Parents are instructed to pat and comfort their baby after each predetermined period of time, but not to pick up or feed their baby. This routine is called “progressive waiting.” The suggested waiting time, which Ferber charts in his book, is based on how comfortable you are with the technique, how many days you’ve been using it, and how many times you’ve already checked on your child that night.

After a few days to a week of gradually increasing the waiting time, the theory goes, most babies learn to fall asleep on their own, having discovered that crying earns nothing more than a brief check from you.

There are several other methods of sleep training your baby as well.

If you are interested in the topic here are some books you might want to read.
Solve Your Child’s Sleep Problems by Richard Ferber
Healthy Sleep Habits, Happy Child by Marc Weissbluth
The No-Cry Sleep Solution for Toddlers and Preschoolers: Gentle Ways to Stop Bedtime Battles and Improve Your Child’s Sleep
The No-Cry Sleep Solution: Gentle Ways to Help Your Baby Sleep Through the Night
Secrets of the Baby Whisperer: How to Calm, Connect, and Communicate with Your Baby