Environment refers to all that is within the reach of someone in their day today involvement and living. It refers to what is accessible and available to someone ; this environment according to the subject of discussion refers to people who are around and in the life of some as they grow. Parents, siblings, house helpers, care takers of family affairs like gardeners and the community at large all form what we call environment as far as child development is concerned.
@Erik Erickson, provides vital information on how environment may affect one's development and what needs to be done to achieve health/ normal development. His theory suggests that "a person's ego identity develops throughout an entire life during the following eight specific stages:
Infancy – Basic trust versus mistrust
Toddler – Autonomy versus shame and doubt
Preschool-age – Initiative versus guilt
School-age – Industry versus inferiority
Adolescence – Identity versus identity confusion
Young adulthood – Intimacy versus isolation
Middle age – Generativity versus stagnation
Older adulthood – Integrity versus despair
Each of these stages is a building block that's crucial to maturation across the span of your life. These stages don’t end with one and begin with another, though. Erikson suggested that these stages may overlap. A stage you don't master may extend into other stages later in life."
Providing an enabling environment by everyone who forms the environment is the basic way yet very instrumental in disentangling the nature - nurture factors that will lead to the flourishment of the child's development.
It takes conscious and intentional actions, interactions and relations hinged on values that promote life ( Life giving).
For example paying attention to my actions, words and intention towards another person so as not to bring out anything that will cause harm or hurt development at any moment in life according to the above listed stages.