pregnancy week by week

Fetal Development

Baby developing inside you
over the weeks and months
baby fetus inside


Weeks, Months and Trimesters Guides

Your Weekly Guide  Your Monthly Guide Your Trimester Guide
How many weeks pregnant am I ? Pregnancy weeks calculator

How many weeks pregnant am I ?

Using the first day of your last menstrual cycle you can figure out when you most likely conceived, how old your baby currently is, and when your baby's birth is expected. If you don't know the length of your cycle, leave that space blank and the average 28 days will be used to calculate your information.


Due Date and Weeks Calculator:

week by weekpregnancy weeksdue date Monthfetus ageDaygestation ageYear
how pregnant am i Last Menstrual Period:weeks pregnant pregnacy calculator baby
Average Length of Cycles:
(22 to 40) (defaults to 28) 
weeks calculate

Estimated Conception: weeks fetus
Estimated Due Date: size time
Since LMP: week by week fetal age
pregnant date
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Week By Week Pregnancy Calendar

First Trimester
Week 1   Week 2   Week 3   Week 4   Week 5   Week 6   Week 7  
Week 8   Week 9   Week 10   Week 11   Week 12   Week 13

Second Trimester
Week 14   Week 15   Week 16   Week 17   Week 18   Week 19   Week 20  
Week 21   Week 22   Week 23   Week 24   Week 25   Week 26

Third Trimester
Week 27   Week 28   Week 29   Week 30   Week 31   Week 32   Week 33  
Week 34   Week 35   Week 36   Week 37   Week 38   Week 39   Week 40

The following Fetal Development information is used as a general guide for healthy pregnancy development, although development may vary due to the motherís health or a miscalculation of ovulation. Gestational age is the age of the pregnancy from the last normal menstrual period (LMP), and fetal age is the actual age of the growing baby.

Most references to pregnancy are usually in gestational age rather than fetal age development, but we have included both so that it is clear what stage development is at. Measurements will be given in total length from crown to rump (CRL) or [head to buttucks] up to week 20 and after week 20 are then given as head to heel. Each pregnancy can differ in weight and length measurements, and these are just a general guideline.

Pregnancy is also divided into trimesters which last about 12 - 14 weeks each. Similar to development, these can be calculated from different dates so not all trimester calculations will equal the same. The following information divides the three trimesters into a little over 3 completed months each. The first trimester is week 1 through to the end of week 13. The second trimester usually ends around the 26th week and consists of the 4th, 5th and 6th completed months. The third trimester can end anywhere between the 38th - 42nd week and is the 7th, 8th and 9th completed months of pregnancy.

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