S.F.
My son is six monthes and I was having this problem until just a week ago. I had asked several peds, researched extensively the internet and everything I could think of and NOTHING WORKED. I would try to let him cry it out, but he would cry for hours. I was at the end of my rope. My husband polled the women he worked with and most people said the standby rice in bottle. That does not work for most people and it is a myth that getting them fuller makes them sleep according to several peds I asked. HERE IS WHAT FINALLY WORKED. . One woman suggested that we put a metronome in his room. The constant noise soothes them. We did not have a metronome nor did we want to invest in one so I bought a homemedics sound machine from Walgreens and when I put him to bed, I started turning on the SOUND OF RAIN or WATERFALL. That night hw only woke up once ( He had been waking up 4-6 times a night) for a week he woke up once a night. Last night for the first time, he slept through the night. I am eccastic!! So, I figured it was worth a try for you. Play some constant, low, noise while he sleeps. Nothing shocking or beeping, basically, something that would soothe you. Good Luck!