D.W.
Hi, My little one was also born in April and it is truly amaizing at how she has grown. This is my husband and mine's first child and he is an only child. I know how hard it is. We decided to do the cold turkey method. I even spoke with her doctor before tring it :). We would feed her formula right before bed and than, and now, I spend 15min rocking her for her "down time". I kiss her and put her in her crib. Because your son is use to sleeping with you (my daughter slept in the same room with us for awhie so she could always see us) he will probably cry. I would just go be with my husband and cry while she cried. The first night was about 30 min and it killed me but I was reasured that this was the right thing to do. By the second night it was 15 min, third just a few little wimpers and now there are nights she just wants to be laid down and not rocked (though that bit of indepandence already kills me) Also, babies wake up on average 3 times a night and all we do is to allow her to fuss and comfort herself. It usally only takes about 10 or so min. As long as it is not a pain cry we just let her fuss and find self comfort. She now sleeps 9-12 hours a night, waking every so often but putting herself back to sleep.
Both of her grandmothers wont put her to sleep either so we try to be home for her bed time and if we can't I tend to spend alittle extra time rocking or reading to get her to calm down. I have no luck with them either. Sorry that I can't help you there.