As you begin to try and get your child to sleep on his own, you should introduce items into his sleeping routine that he can sleep with, such as a particular blanket or a stuffed animal. What this will do is create associations for your child with these items for sleep. Then, when he awakes in the middle of the night, he will be able to recreate a sleeping environment without your assistance by grabbing his stuffed animal, etc. It can also be beneficial to introduce "transitional items" into your baby's bedtime routine: Allow him to have his stuffed animal or blanket with him during a final feeding and before-bedtime activities, and allow him to take these things with him to bed.
No matter what you do, your child is going to be creating his or her own sleep associations. Your job is to try and create associations with items that are under his or her control. By giving your child as much control over his sleeping environment as possible, you allow him to begin to achieve sleep independently. The most difficult transition in early parenting is the one towards independent sleep for your child, and if you introduce new items into your child's sleeping place, you will hasten this transition, which will soon allow both you and your child to get a good night's rest.
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Brandon C. Hall maintains (www.freeinfoblog.com) which contains many articles and resources on baby sleep tips at (www.freeinfoblog.com/category/baby-sleep-tips). There is also information on dozens of other topics.