NO it is not OKay once in awhile. In my home state in Australia it is Law that children upto the age of 18 months must be restrained in an approved child saftey retraint they are talking of upping that to 10 years old but it is law that children and adult passengers no matter what age must wear a seat belt at all times otherwise the driver will be fined and lose their licences if it should also happen that its an adult passenger who fails to wear a seat belt then  that person is also fined and if they carry a D/L then they can lose theirs also. It is also an instant fail of a driving test if you fail to apply your seat belt before turning on your ignition.