Hi there, at 5 days old, baby is still readjusting to life outside the womb and that's maybe the reason for the crying. I'm afraid the intermittent crying will continue for a while more. But as baby grows older, the crying will not be as constant. Experts observe that babies will start to sleep for a longer period of time between 4-6 months. However, sleeping through the night for more than an 8-hour stretch typically occurs after 6 months.
Baby's ability to sleep through the night can be achieved when night time feedings stop, which baby will be ready for, maybe after 6 months.
Hang in there!