Parents who did not sleep train, at what age and how did your children learn to go to sleep by themselves?

Also, when did they start sleeping through the night? Did you ever regret not doing it?By sleep training I mean any method, either gentle or crying it out. I'm curios about how it happens. I saw a similar discussion, but I would like to have some more details about the process. via /r/Parenting https://ift.tt/2IV7gIQ