Could be his 6 weeks growth spurt a tad early! Brenden was absolutely ravenous well before 3 hours then. Early nap wakings could be due to hunger. You'll know if it's a growth spurt if it passes in a few days. You can try extending his naps but watch carefully to see if he is showing signs of hunger -ie. listen to his cry and watch what his mouth is doing. It is very easy to confuse hunger with tiredness and vice versa and it gets confusing when they hit a spurt and their routine gets thrown way out of whack! Another indication of a growth spurt is him waking more often at night and taking more feeds through the night. There are techniques in tbw book on how to up his food intake in the day so he won't need to have extra at night through the growth spurt. But, if he wakes up extra tonight, feed him! then, try to get more in him through the day tomorrow.