Is it bad for a 4 month old baby to watch television?
yes. ====studies are inconclusive whether or not babies should watch TV. the recommendation is to limit TV for children under 2 years old. see the links below for more information.
Should a 4 month old baby be let watch tv?
no it could see something that it's not supposed to see yet.
Why is it easier for a baby to survive when it is born in the eighth month rather than the sixth month?
A baby does not have well developed lungs and other vital organs to survive on its own until later in the pregnancy. it is always best to be as close to 40 weeks as possible.