It's totally normal, when we went in for DS's 2 weeks check up, his Ped (also a mom) told me: "'he's going to start being really fussy and crying for no reason from now until about 8 weeks" and then she told me to get the Happiest Baby on the Block book or DVD. Best rec ever. The book really goes into why it's normal for them to be like that, they're adjusting to a new world and not very mature neurologically. The 5 S's technique is what kept us sane those first 2 months. And it will get better, I promise, and you'll have lots of time for tummy time, and everything else.