A.M.
we had our daughter go in her bed at 3. it started with laying down with her, and leaving when she went to sleep. we went back in if she woke. then we went to start saying, we would be in in a few minutes, and she would call, and we would keep saying, just a few minutes. if she called again, we went in till she was asleep. now we read her a book, leave, and she is awake for like 30 mins, then falls asleep. if she wakes in the middle of the night, i tell her all is fine, and she goes right back. just do a nice bedtime routine, get him used to his room first by being there till he falls asleep, and make a big deal about it all. maybe special bedtime toy to have. it will be a very easy transition, if you be patient until he is ready to "fall alseep" without you there. also this time since dad and he have a bond, maybe have dad play special games at night and read the story. get your son really wanting to be with daddy, then have daddy do the night time ritual just for the "boys". good luck.
in response to "This is a great example of why we should not take the easy way out with newborns because then we have to deal with it later on" i am very disappointed. obviously you have no idea about the benefits of cosleeping or extended nursing. it is much easier to just let your baby cry themselves to sleep out of exhaustion. we dont cosleep to make things "easier", quite the contrary, it is much harder to decide to be an attachment parent. if you do research on the subject of cosleeping, you will read all the studies that show cosleeping produced more independant and empathetic children. there is a long list of overall benefits. we have memories with our children first thing in the morning waking up between us that non-cosleepers will never experience. we are one of the few countries that expect babies to be by themselves in a crib at young ages. as americans, we are so caught up in pushing our children to be independant. babies are babies for such a short time. in regards to extended breastfeeding, the american academy of pediatrics recommends breastfeeding until 2 yrs old, however there is absolutely no reason to expect the benefits will not continue after 2 yrs old. you should continue it till either mom or child no longer wants to.
before making harsh statements judging another mother, it would be nice for others to have their facts straight. M. has made educated choices as to what type of parent she wants to be. those are CHOICES to be a more attached parent, not someone taking the easy way out. a month or 2 of adjusting her son to his own bed is nothing compared to the wonderful experience she has had. and i know nothing about others marriage, but my children dont come between my husband and i in any way and im actually confused why that was mentioned. there are lots of fathers who are proud to cosleep. it actually strengthens are bond as a family, and as a husband and wife.