My 4 week old son for the past 4 nights has wanted to nurse non-stop between the hours of 12 and 4 am. He nurses until he falls asleep. His nursing sessions are approximately 30 mins as he nurses on both sides. But he only stays asleep for 10 mins before he wakes up and wants to nurse again. When he isn't nursing he is really fussy and crying nonstop, similar to a colicky baby. At around 4 am he finally falls asleep, only if he is is laying on my chest in my bed. At that time he will sleep for 3 hours. I can't get him to sleep in his bassinet which is located right next to me. During the day he nurses every 2 to 3 hours which he always does. He doesn't seem as fussy during the day. He is gaining weight and has approximately 5 poops and 10 wets a day. Is this a growth spurt? How much longer should I expect this behavior? Any suggestions...getting really exhausted.