My DS is 3.5 weeks old and the past two days he nursed every 1.5 to 2 hours round the clock it seemed. He also wouldn't sleep much at all during the day (30 minutes maybe at a time) and didn't go to sleep for night until around midnight or so. He was extremely fussy.
Today on the other hand he has just wanted to sleep all day and hardly nurse any. When I try and nurse him he either is still sleepy and nurses well (maybe 4 sessions have been this way today) and then the other times he is so fussy and just pulls off and screams when I feed him. When they go through a growth spurt, do they eat for several days non-stop and then just want to sleep a day and not eat much? His diaper output has been very good today like it always is.