Pregnancy Weeks to Months Conversion

By Alicia Bodine
Woman taking pregnancy test
Woman taking pregnancy test

Normal pregnancies last nine months. This nine months consists of 40 weeks with the date of the woman's last period used as the starting date. These nine months are then broken up into trimesters. This may be confusing to first time moms. A chart can help break down the trimesters into weeks and months so that new moms can follow along and learn what to expect along the way.

Trimester 1

Woman looking at ultrasound photos
Woman looking at ultrasound photos

Your first trimester consists of 13 weeks. You will experience your first three months of pregnancy during this time with each month consisting of four weeks and about two days. Weeks one through four are the first month. The second month is weeks five through eight and the third month of the first trimester is weeks nine through 13.

During the first trimester women may begin to feel a little nauseous and even experience a little vomiting. You may begin to feel tired and get sore breasts. Food cravings can begin during this time if the nausea isn't overpowering.

Trimester 2

Woman in 2nd trimester
Woman in 2nd trimester

Weeks 14 through 26 make up your second trimester, months four to six of your pregnancy. The fourth month includes weeks 14 through 17 while the fifth month includes weeks 18 to 21. The trimester is finished off in month six with weeks 22 through 26.

During the second trimester women begin to gain weight and show a cute baby tummy. They may crave more foods and notice that they are frequenting the restrooms more often. It is also possible for women to feel flutters after the fifth month, which is the start of feeling the baby move around in the uterus.

Trimester 3

Woman in 3rd trimester
Woman in 3rd trimester

Your third trimester is the last trimester of your pregnancy. It begins at 27 weeks and ends when you deliver your baby. Usually the delivery occurs around 40 weeks. Month seven consists of weeks 27 through 30. Month eight includes weeks 31 to 35, and month nine finishes up the pregnancy with weeks 36 to 40.

The last trimester is when the woman gains the most weight. It is possible for feet to swell and backs to ache as the baby grows. Check-ups gradually begin to increase until the woman hits month nine. Then she will go to the doctor once each week. The doctor will check to see if her body is beginning to get ready for delivery and if there are any problems.

About the Author

Alicia Bodine has been a professional writer for six years. She has produced thousands of articles for online publications such as Demand Studios, Bright Hub, Associated Content and WiseGeek. Bodine is also the current cooking guru for LifeTips. She has received awards for being a top content producer.