When I first brought Rowan home, she was so little I was afraid to put her in the crib. It was just way too big for such a tiny baby. Then, when we found out she had acid reflux, we found she slept better in the Nap Nanny, which let her sleep semi upright, which helped her digestion.
Now that Rowan is getting bigger, I'm getting her used to sleeping in the crib. She's not so little any more!