If your baby only sleeps when held, there are a few things you can do to help encourage them to sleep on their own. First, make sure that they are getting enough daytime nap time. A well-rested baby is more likely to be able to fall asleep on their own at night. Second, try putting them down for naps and nighttime sleep in a quiet, dark room. This will help cue their body that it is time to sleep. Third, create a bedtime routine that includes calming activities such as reading or rocking in order to help them transition from wakefulness to sleepiness. Finally, be patient and consistent with your efforts – it may take some time for your baby to adjust to sleeping on their own but eventually they will get there!