How good does your baby sleep?

My son is almost 4 weeks old. It seems like he doesn't sleep as much as he should. Well he's mys econd baby and my first one just slept soooooo good! Like 3 hours at a time, pretty much all day. And he slept through the night at a month old. With this one, ever since we brought him back from the hospital, he hasn't been sleeping as good. He wants to be held all the time, and being rocked and he does sleep but maybe an hour or so at a time, sometimes longer. He sleeps okay at night, about 3 hours between feedings. I'm not complaining about the night sleeping, more during the day, I wish he would sleep longer and more often! Maybe it's because I got lucky with my firstbaby, he was sleeping all the time!

*just bumping in* I've got to get some answers!