Physical Development Crossword

Based on a combination of genetics and environment.
How many principles of growth do humans go through?
The amount of chromosomes new life inherits from each parent.
The stage in which the heart begins to beat; backbone and muscles are forming.
The new life sleeps, awakens, exercises, turns its head, and opens and closes its mouth.
By this age, the baby enjoys games and songs
The development of the central nervous system begins.
By this age, the child has reached fifty percent of his adult height.
Birth to Two years old.
This gender tends to weigh more than the other gender at birth.
This slows down after nine months.
This development begins around thirteen months.
Development that starts at eight months.
How much does the average child weigh by the age of three.
Between the ages of six to twelve, the major growth and changes are in this domain.