nothing really helped my bub in the first few months to sleep, except me holding her, so we barely used the nursery and it was just in mums arms on the couch a lot of the times...
however...
this is not quite the exact question u asked, but the one thing i could not live without was my fisher price cradle swing.... sometimes when nothing else would work i would pop her in there and she would doze, and i could get a break. the one thing i would not attempt motherhood without, especially if you have a colicy, refluxy bub, or a terrible terrible sleeper...