Final answer:
Braxton Hicks contractions are the type of contraction that occurs from the 4th month through the end of pregnancy. They are sporadic and play a role in preparing the body for labor.
Step-by-step explanation:
The type of contraction that occurs from the 4th month through the end of pregnancy is Braxton Hicks contractions. Braxton Hicks contractions are sporadic uterine contractions that play a role in preparing the body for labor. They are characterized by mild, irregular contractions that are often painless and do not cause cervical dilation. While these contractions may be uncomfortable, they are typically not a cause for concern.