Don't feel guilty for giving your child what she needs. I nursed my oldest to sleep until it stopped working. Then we moved on to other developmentally appropriate means of getting to sleep. Now at 3.75, we're working on her falling asleep without me in the room. I'm currently sitting in the doorway while she lays in bed. Her brother is asleep and I nursed him to sleep. He's 16 months old. Yes, some people get their kids to fall asleep alone much sooner than nearly 4; however, I know from talking to people that both the kid and the parents aren't any better off for it. Additionally, I believe it's much more psychologically healthy for kids and babies to have help getting to sleep until they are ready to be independent with it.