I didn't notice anything different other than he was sleeping more during the day. He didn't seem to want to eat any more than normal. He began sleeping a 7-8 hour stretch around that time.
I honestly never noticed any growth spurts. I noticed an improvement in sleep around 6-7 weeks, but that's also when I started letting him sleep on his belly, so that's probably why.
Re: Anyone not notice a 6 week growth spurt?