Are travel cribs safe for overnight sleep?

Travel cribs that meet U.S. CPSC play yard safety standards are considered safe for unsupervised sleep when used with the firm mattress they shipped with. Add-on bassinet inserts and 'sleep nest' attachments are more controversial — specialist parenting communities frequently flag soft, hammock-style bassinet attachments as fine for supervised naps but questionable for unsupervised overnight sleep. Always use the crib as the manufacturer specifies, with no extra padding.