NO worry. That's normal. I have extracted this from a baby book for your reference
He might gbe going through a growth spurt (most common at 3 weeks and again at six), or he might just need more milk to keep him satisfied. Either way, what he's doing to make sure he gets that milk is called "cluster feeding". His instincts tell him that nursing for twenty minutes every hour is a more efficient way of coercingyour breasts to produce the extra milk he needs than nursing for thrity minutes every two or three hours. And so he treats you like a snack bar rather than a restaurant.
Such marathon sessions are exhausting. But good news is that the cluster feeding usually lasts only a day or two, the time it takes for your milk supply to catch up with your growing baby's demand. he's then likely to return to a more consistent pattern of nursing. In the meantime, bring on the feed as often as your little bottomless pit seems to want it.