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. 

Ok, before buying a burger. think of you diet and calories. how many calories are you suppose to eat a day. and look at how much fat, calories, salt is in it. if it is ok to you, then buy it. but if you think that it's to much fat and salt for you. don't buy !