3 yr old won't go to bed anymore! HELP

We switched rooms around 2 wks before our new son was born. The baby is 3 1/2 weeks old and it's only gotten worse. My 3 yr old will NOT stay in his room. He wants someone to stay in there with him till e falls asleep. I can't do this with the baby. My husband works most nights so I'm on my own for bedtime. Even ifi stay in there he ends up waking in the night. We've tried disciplining, nurturing, seeing if he'll fall asleep to a movie! Nothing works. I need help, advise. Don't know what to do anymore!

This is really difficult. I have a 5 year old, 3 year old and nearly 2 year old and juggling bedtimes is one of the most frustrating things we deal with. Most of the time, my wife and I divide and conquer, but when one of us is home alone, we try to put them down in shifts. My 3 year old needs someone in the room with her to fall asleep, so we try to put down the 2 year old and move on from there. Often times, she comes into our room in the middle of the night and we just let it happen, Some of those times, we will wait until she is asleep and carry her into her bed. Keep trying different things until you find what works. Good luck!

The problem is it will take over 2 hrs of putting him back into bed because he just won't go to sleep. So even if I have the baby sleeping at some point he wake to breast feed which makes it even more difficult. Usually I am on my own at night, so dividing and conquering doesn't happen. If I do stay in the room it takes forever for him to fall asleep which before I would end of falling asleep with him but I can't do that now with the baby. I am fearful if I do fall asleep in his room I'll miss the baby crying. And now I'm much more likely to fall asleep being sleep deprived.

You may want to try some new tricks to get him to stay in his bed. I put a baby gate up on my 3 year old's doorway to encourage him to stay in his room. Then I put a fish tank in his room with lights so he could watch the fish. Finally, I put a CD of bedtime stories on in his room. It is a kids CD of classic stories like Peter Rabbit and Thumbelina. He listens to this and falls asleep. 

Now this will only work if he is tired. SO you have to look at his nap schedule. Is he napping too much or too long in the day? If so, try limiting his nap or letting him cut it out all together. Also, make sure he is not hyping up as the night approaches. If he is running all over the house it will be hard to put him down to sleep. 

Lastly, make a chart with stickers. When he goes to sleep well...and stays asleep..put a sticker on his chart. If you stay consistent, it will work. Just don't give in and sleep with him or he will learn just to cry or get up longer. Good luck!