J.S.
If you want to start sleep training then I would get the book
Good Night Sleep Tight by Kim West. It is great. It will help you with a guideline and ways to start sleep training. We used it with both my kids and it is amazing how well it works. And the best is you don't have to let them cry it out. The book is quick to read because it is sectioned off by age and goes all the way up to age 5. It also has sections for routine busters like holidays, illness, travel, etc. I hope this helps.