4fb89720_nd_solving_baby_sleep_problems__What_to_try
[Problem] "My baby startles into wakefulness the moment I get him to sleep. Then I have to start trying to get him to sleep all over again." [What to try] 
You can minimize the likelihood of startling once baby is in bed by minimizing transition to sleep environment: smell, temperature, noise, motion/vibration. As baby gets a little older, you'll want to start thinking about encouraging a self -- soothing routine, but while the colic is the primary concern, make soothing your baby the priority.
From A to ZZZZs: The quick guide to preventing and solving baby sleep problems
What to try