What biological factors contribute to normal development in?

Proper nutrition and care.

Guidance is approach to an individual wherein you provide support, clarity and actually guide the individual to where they can reach their fullest potential. 
This helping intervening-action exhibits and initiates cognitive, affect and behavioral awareness to the individual receiving it.

An example is, when a parent asks what his/her child wants in his/her goals, this can exhibit a parental action to counseling where the parent can listen to the different aspirations of his/her kid and on the process guiding him/her what are the best possible options the parent thinks or the alternatives. This is just to let the child appreciate his/her sense of individuality and openness to explore the areas. 

It is less likely that the shoe will slip while someone is walking

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant