To get your 9-month-old baby to sleep well at night, you'll need to train her to soothe herself to sleep, help reduce her separation anxiety and eliminate night feeding. At this stage, according to BabyCenter, your baby should begin reducing her amount of daytime rest to two naps, usually in the morning and in the afternoon. If your baby resists altering her sleeping habits and shows extreme changes in mood, stop the new sleeping schedule and try it again after a week or two has passed.
The ideal sleep schedule for a 9-month-old is two naps in the day and sleeping through the night, which can be 11 to 14 hours.
The "cry it out" method is a tried-and-true way of getting a baby to adjust to night sleeping. This traditional method works by putting your baby in his crib while he is awake, allowing him to cry, and coming in to comfort him at 5-minute intervals. Every night, increase the length of time it takes to comfort your baby until the crying ceases. However, BabyCenter says this method is controversial and has been called cruel and unnatural.
The "no tears" method involves creating a soothing environment for your child, rocking him to sleep and responding as soon as he cries. This method has been criticized as well; some say it makes babies dependent on a parent to fall asleep instead of falling asleep on their own.
Your baby should be able to sleep for long stretches without waking up in the middle of the night. If your baby does wake up due to hunger or habit, practice night weaning to help her sleep longer. To night wean, feed your baby more food throughout the day -- or at least in the evening -- so that she isn't hungry at night. You can also wean your baby by gradually diluting her formula with water during the night feeding. The point of this is to train your baby to associate night feeding with watered-down formula, thus making her not want to be fed in the middle of the night.
Your baby may experience separation anxiety when he wakes up and you're not there. As his motor skills improve, he may wake up in the middle of the night just to be active. This can be adressed by putting your baby on a daily schedule. Waking your baby up, feeding him, and putting him to bed at the same time can help him adjust to the schedule and sleep throughout the night. According to William Sears, author of "The Baby Book," allowing your baby to fall asleep and stay asleep on his own without your help will develop healthy sleeping habits.