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i do not give you this information out of any need to judge you and how you are parenting, i dont want you to feel guilty or upset at yourself for doing what you thought was best at the time... you just take the knowledge you have and use your instincts to lead you to the most appropriate solution. even this advice is only to be taken if you feel it is right for you, your family, and your child. only you know your babies!
see if you can find any info on crying it out.
first of all, i would assume that this is a teething issue, or at her age, it could be the rolling over or sitting up stage.. every developmental stage babies go through causes a sleep disruption. its how you deal with it that matters...
lots of parents try this cry it out thing out of desperation, but dont fully understand how and why it works.
what is "it" and where is "out"?
basically, you leave baby to cry (even with checking on him or her) alone in their room/bed, whatever. what they start to realize is that their only form of communicating that something is wrong is not being heard nor is there any comfort for their needs.. (needs and wants are the same to babies under one year of age - you will notice when this changes, my sons cries changed from urgent to a little bit more like "im ok, but you could do something" cries around 11 months) they do stop crying, but out of depression that they arent being responded to, not because they have "learned" to self soothe. no baby is born with the ability to do this, and it may not happen for a long long time... this must be learned over time, and the best way, in my opinion, to teach this is to always always always be responsive so that fear, loneliness and crying isnt associated with their beds and sleep. put it this way, if a baby starts noticing that being in the crib is where baby is alone, and crying, that doesnt really give baby a very good feeling about the crib does it? you might start noticing that baby is crying before you get to the crib, or maybe just when walking into the room cuz they think "uh oh, im gonna be left alone and crying again..."
more of us need to put ourselves into our children's shoes... realize how it would feel to be left alone and afraid.
my son first slept through the night when he was 15 months old, (off and on, he wouldnt stay asleep all night until 17 months old) and even as tired as i was, and as frustrating as it was some nights, my son is not afraid to be in his crib, he is not afraid of bedtime or naptime. i can put him down after prayer and snuggle, rub his back for a minute and leave the room and i wont hear a peep until he is done sleeping. my friend used cry it out on her kids and her kids all crawled out of their cribs at 8 months old.
i understand that you have 2 other kids to take care of, i have a child care in my home. i still managed to put in the time holding, snuggling, nursing, and making sure that there wasnt a need for any crying it out. the most useful item i ever bought was a moby wrap - it allowed me to hold and comfort my baby while i was taking care of other kids. he slept in it and i could lay him down and because he was wrapped up, he usually would stay asleep.
the whole idea that babies must be trained is very disconnecting, we train dogs, we raise babies. its going to be difficult, its going to be exhausting, its going to be frustrating, no one should ever go into parenting thinking it is easy. we have babies to change our lives, to fit our lives into a life with children, not so that we can fit children into our normal pre-children lives, or at least thats how we should see it.
DONT GET ME WRONG, if you are at your wits end, and theres no one there to help you comfort baby, PLEASE PUT BABY DOWN AND LEAVE THE ROOM. its more important that you can retain some sanity and not end up hurting your child at that point. that is how shaken baby syndrome ends up happening. however, i only found that in 15 months i ran across that feeling twice or three times, and afterwards i realize that what was keeping my son awake was my frustration and lack of relaxation. babies can sense that most of all.
anyway, sleep is a difficult thing, and requires a LOT of dedication and work.. its NEVER going to be easy. some kids just dont sleep for long periods. this is actually a good thing in babies, babies who do NOT sleep through the night have less risk for SIDS because they are able to wake easier if something were to interfere with their breathing or something. make sense? so actually you shouldnt want your child to sleep through the night, you want them to be sensitive to their environment enough that if something were wrong, they would wake up. im not saying that this is a guarantee cause or preventative measure, but reasearch seems to show that it helps.
anwyay, good luck and i hope that i havent offended you by this direct, no nonsense approach....