At four months old, most babies sleep for around 15 hours per day, according to Stanford Children's Health. This can be split between 9 or 10 hours of sleep throughout the night, with the rest being made up of 3 or 4 naps during the daytime. However, a little bit more or less than this is also perfectly normal - every baby is unique, and not every baby will sleep on the same schedule.
If you're transitioning away from swaddling and you're worried about your baby getting enough sleep, you can try using sleep aids like a pacifier, a baby-safe white noise machine, or our Zen Sack wearable blanket designed for babies in this developmental stage.