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Baby Size by Pregnancy Week Calculator
Current Pregnancy Information
Current Week:
Current Trimester:
Days Pregnant:
Estimated Conception Date:
Last Menstrual Period (LMP):
Trimester Information
First Trimester:
Second Trimester:
Third Trimester:
Fertile Window Estimation
Fertile Window:
Most Likely Conception Date:
Current Milestone
Understanding Your Pregnancy Journey
How Pregnancy is Calculated
Pregnancy is typically calculated from the first day of your last menstrual period (LMP), not from the date of conception. This means that at the moment of conception, you're already considered about two weeks pregnant. The standard pregnancy lasts approximately 280 days or 40 weeks from the LMP, though this can vary between individuals.
The Three Trimesters
Pregnancy is divided into three trimesters, each lasting approximately 13-14 weeks:
First Trimester (Weeks 1-13): This is a crucial period of development when your baby's organs and structures begin to form. Many women experience morning sickness and fatigue during this time.
Second Trimester (Weeks 14-27): Often called the "golden period" of pregnancy, many women find their energy returns and morning sickness subsides. You'll likely begin to feel your baby move during this trimester.
Third Trimester (Weeks 28-40+): As your baby continues to grow, you may experience increased discomfort and fatigue. This is when your baby gains the most weight and prepares for life outside the womb.
Baby's Development Throughout Pregnancy
Throughout your pregnancy, your baby undergoes remarkable development:
Weeks 1-4: The fertilized egg implants in the uterus and begins to form the embryo and placenta.
Weeks 5-8: Major organs and systems begin to develop. The heart starts beating around week 5.
Weeks 9-12: The embryo is now called a fetus. Facial features become more defined, and tiny buds that will become arms and legs appear.
Weeks 13-16: Your baby can make sucking motions with their mouth and may even suck their thumb. The sex of your baby may be visible on ultrasound.
Weeks 17-20: You may begin to feel your baby move, a sensation called "quickening." Your baby's skin is covered in a waxy coating called vernix.
Weeks 21-24: Your baby's eyebrows and eyelashes have formed, and they can hear sounds from the outside world.
Weeks 25-28: Your baby's lungs are developing, and they're practicing breathing movements. They now have regular sleep-wake cycles.
Weeks 29-32: Your baby's bones are fully developed but still soft. They're gaining weight rapidly.
Weeks 33-36: Your baby's central nervous system is maturing, and they're practicing blinking and sucking.
Weeks 37-40: Your baby is considered full-term and may arrive at any time. They continue to gain weight and their lungs mature in preparation for breathing air.
Tracking Your Pregnancy
Using a pregnancy calculator like this one can help you track your progress and understand what to expect at each stage. Knowing your current week and trimester can help you prepare for upcoming changes and milestones in your pregnancy journey.
When to Consult Your Healthcare Provider
While this calculator provides helpful information, it's important to remember that every pregnancy is unique. Regular prenatal care with a healthcare provider is essential for monitoring your health and your baby's development. Be sure to contact your healthcare provider if you have any concerns or questions about your pregnancy.
Frequently Asked Questions
Due date calculators are typically accurate within a week or two. The most accurate way to determine your due date is through an early ultrasound, which can measure the size of your fetus and provide a more precise estimate.
Yes, your due date may be adjusted during pregnancy, especially after your first ultrasound. Healthcare providers often update due dates based on fetal growth measurements, which can be more accurate than calculating from your last menstrual period.
If you're unsure about your last menstrual period date, an early ultrasound is the best way to estimate your due date. During the first trimester, ultrasound measurements of the fetus are very accurate for determining gestational age.
Yes, it's quite common to go past your due date. Only about 5% of babies are born on their exact due date. First-time mothers are more likely to go beyond their due date, sometimes up to 42 weeks. Your healthcare provider will monitor you and your baby if your pregnancy extends beyond your due date.
Conception typically occurs about two weeks after the first day of your last menstrual period. Our calculator estimates your conception date by subtracting 266 days (38 weeks) from your due date, as this is the average time from conception to birth.
The fertile window is the six-day period ending on the day of ovulation when pregnancy is most likely to occur. This includes the five days before ovulation and the day of ovulation itself. Sperm can survive in the female reproductive tract for up to five days, while an egg is viable for about 24 hours after ovulation.
The length of pregnancy is typically calculated as 280 days (40 weeks) from the first day of the last menstrual period. However, normal pregnancies can range from 37 to 42 weeks. Our calculator allows you to adjust the gestational length if you have specific information from your healthcare provider.
Disclaimer: This calculator provides estimates based on the information you provide and standard pregnancy calculations. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding your pregnancy or medical condition.
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