Prenatal Development and newborn

how old is this baby?

Jimmy jr. is easy frightened from strangers and loves playing pik-a-bo

when something touches Peter's cheek, he turns toward it with a open mouth

_____ are harmful agents such as certain viruses and drugs 

The heart starts to beat around ____ weeks

a human organism begins as a(n)

What of the following is in the correct order of development?

Jimmy is learning to count in his head and beginning to memorize multiplication tables. 

A newborn learns that cats are not the same as "doggies" and learns to call the cat kitty

What is the survival rate of zygotes after fertilization?