Development starts from the day they are born but a critical part of it is with mom and her pups. The kind of mother she is will help them to find their coping skills, gain trust and be receptive to the world presented to them.
If a mom is not a positive influence on their pups no matter how nicely structured or beautiful they are, they shouldn't be bred. Just like humans, not everyone has the patience to be a 'good' mom.
I am blessed to have amazing moms and it's photos like this one that shows the attentiveness and gentleness that the moms have but at the same time they are protective, teachers, and mentors with much love. It does my heart good to be a part of this.