There are two answers to that.
The Senate did a study called Child at Risk some years ago, and it found that the two elements of taking care of a child that keep them out of the criminal justice system are the same caregiver for the first three years of their life; it can be a day care worker, it can be a nanny, it can be a mom, it can be a dad, or whatever—the same person, though, stability. That person should be someone who cares about that child, because kids know the difference.
Secondly, there has been a thing called peer attachment disorder, which has been found when little kids have caregivers that change every six months or year. They stop counting on the caregiver to be the stability, so they go to the buddies.