During pregnancy, the second trimester ranges from:

Step-by-step solution

Human pregnancy has an average duration of about 40 weeks, which is divided into three trimesters. The first trimester ranges from the 1^ st week to the 12^ th week. The second trimester ranges from the 13^ th week to the 26^ th week. The third trimester ranges from the 27^ th week to the 40^ th week. Therefore, the second trimester ranges from the 13^ th to the 26^ th week. Answer: 13^ th to 26^ th week