----edited to add:
My apologies for misinterpreting your request - I see now that it was much more of a, "We plan to let our daughter cry-it-out, how soon do we start?" type of request instead of a "When should we...?" request. My bad.
I was a bit shocked by your reply because I never suggested you do this: "I am not, however, going to lay down with her until she falls asleep until she is 9 years old or walk her around for the rest of her young life." I'm sorry it seems so ridiculous for you to lay down with your brand new daughter until she falls asleep, even if that's only for the first months of her life. BOTH my husband and I truly enjoy putting our kids to bed during their first 2-3 years on this earth. And yes, we walked, rocked, sang, and layed down with them. It's how we would want to be treated if we were young!
And an interesting observation -- I've *never* met any older kids (9 yr olds?) that need to be laid down with! Even so, I clearly wasn't suggesting you lay down with her to sleep every single night from birth until she goes off to college. ;)
Last, I didn't realize it was such a radical idea to walk or rock your young baby or toddler to sleep, either. Among my family and friends, many of us saw how baby's sleep changes gradually over time and how our toddlers (usually between 2 & 3 yrs old) did learn *on their own* to go to sleep.
As with everything parenting related, follow your instincts. If you feel that cry-it-out is what your baby needs most, and that it's the best way for you to mother your baby, go for it! I hope it works just the way you think it will (minimal tears, well rested baby) instead of what some others have experienced (takes longer or doesn't work, stressful for both parent and baby, not permanent, needs to be repeated at different developmental stages).
-------original reply:
G., if you tried for 4 *years* to get pregnant and that was a miracle, are you seriously considering letting your tiny, new 10-week-old "cry it out"? Honestly, that's not healthy for her right now anyway -- even hard core "cry-it-out" parents will typically wait until 12 weeks. Please be very, very wary of anything the Ezzo's (Babywise, GFI) publish because they are hard-core cry-it-out advocates to the point of causing harm to the breastfeeding relationship, the baby (failure to thrive!), and they basically bash anyone who does it any differently.
Personally, I don't really ever think that "cry-it-out" is a great method (I list one exception below) because it basically means ignoring the baby, or ignoring them for intervals at a time -- parenting your child to sleep is important, and I don't think ignoring = parenting.
Plus, a baby's first 12 months on earth are spent growing and developing at a RIDICULOUSLY fast rate. Her sleep patterns, how often she eats, how quickly she's developing -- all of these things are DESIGNED to be different from adult patterns! "The Baby Sleep Book" discusses what is really healthy sleep for babies, and how that is DIFFERENT from how we adults sleep.
My suggestion, as a mom of 2, is to ditch that tired "cry-it-out" idea. Be an active nighttime parent -- parent her to sleep just as you parent her during the day, by being *with* her, by creating a very soothing and consistent and simple bedtime routine, by helping her learn the difference between day (bright, activity, etc.) and night (dark, calm, etc.), and by helping her learn to relax herself (stretching/yawning, deep breaths, for example - even tiny babies can mimic this!) so that she can go to sleep. Respond to her cries (I'm not saying to scoop her up at every hiccup or sound, but you probably already know the difference between a little dreamy fussing a small cry that quickly escalates into a wail).
Think about it - crying is a baby's only, and very important!, form of communication. This is her only way to tell you what she needs (and at this age, her wants ARE her needs, she's not trying to trick you into anything!).
I just don't think babies were designed to be left alone in a crib to "cry-it-out" -- there are far gentler, more respectful ways of teaching our babies how to sleep:
* The No Cry Sleep Solution (by Elizabeth Pantely)
* Sleepless in America (by Mary Sheedy Kurcinka)
* The Baby Sleep Book (by Dr. Sears)
* Good Nights: The Happy Parents' Guide (by Dr. Jay Gordon)
* Good Night, Sleep Tight: The Sleep Lady's Gentle Guide (by Kim West)
While it is true that sometimes babies fuss a little bit in their sleep or while going to sleep AND very quickly settle back down, that is quite a bit different from "cry it out" where you essentially leave your baby alone to fend for themselves (or leave but check on them but don't talk or hold them or respond to them in any way). Of course, if you are in a severe situation where you're so sleep deprived that you risk getting angry, shaking or potentially hurting your 10 week old baby, then sure, cry-it-out is safer than the risk of anger/potential abuse. Note: if you feel like you're ready to lose it because you're so exhausted by a baby who is sleeping really poorly all the time, like waking up always after only 15 or 30 minutes, that's likely a sign of your baby having a *health problem* (like undiagnosed food allergy and/or bad reflux or ear pain, etc.) and should be addressed with medical attention, NOT "cry-it-out"!
Anyway, I say just hold and snuggle and love your little baby girl to sleep, because these days of your daughter's infancy will be gone in a FLASH - they grow up before you know it. :) I've never yet met a mom who regretted the time spent (and the bond created by!) rocking her babies to sleep for a few months or even years. I have, however, met moms who tried "cry it out" because everyone else said it was "the thing to do!" and then deeply regretted it... especially because for many, it's not just the "quick fix" that people say it can be. Bottom line, there are much gentler (yet still effective) approaches to helping your baby have healthy sleep.
Congrats on becoming a mom! It's a wild, wild ride. :)