How long does the average newborn sleep? When do newborns start having a proper sleep pattern and why do newborn sleep patterns differ from adults?

I feel like my newborn only wakes to eat. There is very little activity time. The only awake time is probably feeding and burping. For my experience the regular timing comes probably about 2 months of age where nap time becomes more predictable. Sleep for babies is generally for brain development so it's always good to sleep more!