Final answer:
The yy-intercept of the equation W = 2t + 11 is 11 pounds, which represents the weight of the newborn baby at the time of birth.
Step-by-step explanation:
The yy-intercept of the equation W = 2t + 11 represents the weight of the newborn baby at t = 0, which is the time of birth. In this equation, t represents the number of months after birth. When t = 0, the equation simplifies to W = 2(0) + 11 = 11 pounds.
Therefore, the yy-intercept of the equation is 11, and its interpretation in the context of the problem is that a newborn baby weighs 11 pounds at the time of birth.