Hi T.,
Well, you've touched on the most controversial issue in parenting today! Congratulations!
Half the world will tell you to "cry it out".
The other half will tell you that this is insensitive.
Consider that both views can be correct, depending on the circumstances.
If the alternative to letting the baby "cry it out" is throwing the baby out the window, then perhaps you should let the baby cry it out, since there is no physical bodiy injury involved. If you are a working mother and have to get up in the morning and your lack of sleep is placing your job in jeopardy, perhaps cry it out is a good alternative. If you and your husband are on the verge of divorce and believe a quiet baby will help repair the marriage, perhaps cry it out is best. There are other examples. You decide if it is best for you.
The opposing "no cry" view goes something like this:
Babies like to be close. Americans do NOT like to be close. We like our space. Big cars, big houses, babies quietly sleeping down the hall out of our hair. It is a culture thing. Look around the world at other cultures - family sleeping arrangements are the norm in many other societies, including highly developed nations like Japan. There is nothing wierd about parents being close to children and responding to their needs. This teaches children security. 7 months old is NOT an "old" baby who "should know better."
When the baby cries, he has a need. This may be as simple as reassurance that you are there. Or he may actually be hungry. Hard to figure when the poor little guy can't talk, huh? When you let the baby cry, you don't "teach" the baby anything other than that he cries and you don't come. If you stand over the baby and let him cry, his need is obviously still being ignored. After a while, baby learns "when I cry, nobody comes and nobody addresses my need." If you kept asking your mother for something and she ignored you each time, eventually you stop asking, don't you? He is no different. It doesn't take an army of psychologists to figure this one.
If this view makes any sense to you, try reading the "No Cry Sleep Solution" by Elizabeth Pantley. She was a breastfeeding co-sleeping mother. She has a sensible "no-cry" approach to encouraging more nightime quiet. Sleep IS important for you. It takes time to encourage good behavior in children. The time involved takes patience on the part of parents. Patience is another thing that goes against modern American culture - our penchant for quick results.
One more thing - If you are breastfeeding, he may very well be hungry. Most women in our society are not breastfeeding at 7 months, so their babies may sleep through the night earlier. Absolutely nothing digests better and more quickly than breastmilk. This is best for you baby. The flip side - he may be hungry sooner than other formula fed babies. In the end, he may really be hungry. Imagine how you would feel if you knew he was in fact hungry and you stood there and let him cry.
Follow your instincts! They are the very best tool you have!
Good luck!