I just want to add to not get discouraged. My son is also 4.5 months, and it took him a good 4 days to really see results. In the beginning you might start to think, because I know I did, "this is a load of crap." But hang with it. Yesterday for the first time he slept for 2 hours in the morning, and went down easily pretty much all day. Bedtime is still being a work in progress, but that's also becuase we're tweaking his bedtime a bit too. Just hang in there.