Circadian rhythms are well established at 3 to 4 months of age. There is a fixed nap time during the day and a long sleep at night. They sleep an average of 14-15 hours per day. They usually sleep 3-4 naps during the day. Some babies sleep for up to 6 hours continuously at night. This is the time to start training your baby to establish a healthy sleep routine. Ways to establish a regular type of sleep and feeding: Keep a diary of sleep/feeding for a week so you know your baby’s routine. Before he gets fatigued you put your baby down for naps and nighttime sleep (fatigue is indicated by tantrums and rubbing eyes). The key is to be ready 20 minutes earlier once you see those signs of going to sleep before your baby is fatigued, which is actually too late. You happen to put your baby to sleep on his own when he is sleepy. A 3-month-old baby should develop the habit of falling asleep without a nipple. If your baby falls asleep while feeding, you should wake him up and put him to bed when he wakes up to fall asleep again on his own. The goal is to separate the eating and sleeping experience, and as your baby matures, he can develop the habit of eating and sleeping separately. If he wakes up often at night, the mother can try to comfort the baby without breastfeeding. If breastfeeding, you can let dad comfort. If the interval is 4 hours, maybe he is hungry for milk, then breastfeed.