Newborns are immediately safer and usually start to sleep better in 1-2 days! Babies over 6 weeks are immediately safer, but may take 5-7 days to start sleeping better.SNOO quickly helps babies develop healthy sleep habits. Over 200 babies tested and shown to have less crying and more sleep. Use SNOO up to 6 months of age, or until your baby can get up on the hands and knees. Only use SNOO with the SNOO Sack, our special swaddle built for SNOO. What's included: 1 SNOO Smart Sleeper 1 SNOO organic cotton fitted sheet 1 SNOO mattress 3 SNOO Sacks (S, M, L) made with organic cotton Note: This crib was manufactured in 2011 or later and complies with the new federal safety standards issued by the CPSC. The item "SNOO Smart Sleeper International Shipping Baby Crib Brand New" is in sale since Sunday, July 2, 2017. This item is in the category "Consumer Electronics\Surveillance & Smart Home Electronics\Other Smart Home Electronics".electronics" and is located in San Francisco, California. This item can be shipped worldwide.