I had some similar trouble but basically I try to treat Mackenzie the same way during the day as at night except for of course if we are out in the car or visiting!

I still swaddle her and let her cry (more protesting) for about 5 mins. If she continues she gets a little cuddle then back in. Sometimes I do this 2 or 3 times but it usually works.

the mains things I check for are:
- is she fed properly?
- is she clean?
- is she burped?
- is she actually tired?

Once that's all answered then in to bed she goes - and I have to be tough (but not mean!) She sometimes only sleeps for about 1hr but still better than nothing. Don't let your boy get overtired either - that's when he will have trouble.

Now I only learnt all this about 5 weeks ago - before that I was rocking and letting her sleep in my arms too. I read "Save our Sleep" and got some good tips from there. I don't particularly like her STRICT routines but do like her settling tips - worth a read.