Our Ultimate2 bassinets are not tested for overnight safe sleeping practices and we recommend you monitor your little oneregularly while napping in their pram. There are currently no Safety Standardsfor bassinet safe sleeping in US. Some companies will state compliance with aninternational standard however we have been advised by industry experts that they would never approve a pram bassinet as a safe sleeping environment whichis why we continue to encourage regular monitoring. Pram bassinets are much narrower than sleeping bassinets and even with mesh sides that are breathable, when a baby's nose presses up against the mesh it can block their nose causing suffocationrisk (note: babies breathe almost exclusively through their noses until at least 4 months of age).