7 weeks: harder to put down at night?

Sarah
The last week or so my LO will be sound asleep after his night time feeding and bedtime routine. I put him down then 5 minutes later he is waking up. If I let it go, he just continues to get more unhappy and more awake until he is full blown crying and angry. So it's taking some soothing and a couple tries to get him down, sometimes taking an hour. Anyone have any tips? He is breast fed and eats well. Advice on late afternoon or evening naps?