Pregnancy Baby Growth Pregnancy Calculator Week by Week Pictures

Track your baby's growth week by week with our pregnancy calculator and visual guide. Enter your due date or current pregnancy week to see estimated fetal development milestones, including weight, length, and ultrasound pictures.

How to Use This Calculator

Our pregnancy growth calculator provides a week-by-week overview of fetal development. You can use it in two ways:

Enter your due date to see the estimated development for each week of your pregnancy.
Enter your current pregnancy week to see what your baby is likely developing at this stage.

The calculator displays key milestones including estimated fetal weight, length, and head circumference, along with a visual representation of development. For the most accurate results, use an ultrasound to confirm your baby's actual measurements.

Week-by-Week Pregnancy Growth

Pregnancy is divided into three trimesters, each with distinct developmental stages. Here's a general overview:

First Trimester (Weeks 1-12)

During the first trimester, your baby grows from a single cell to a fully formed organism. Key milestones include:

Week 1-2: Implantation and early development
Week 3-4: Heart begins to beat
Week 5-6: Limbs and digits form
Week 7-8: Face begins to take shape
Week 9-12: Baby can hear, swallow, and make facial expressions

Second Trimester (Weeks 13-26)

The second trimester is often called the "golden period" of pregnancy. Your baby continues to grow rapidly:

Week 13-14: Baby can move and make sucking motions
Week 15-16: Hair begins to grow
Week 17-18: Baby can hear outside sounds
Week 19-20: Eyes can focus light
Week 21-26: Baby gains most of their weight and continues to develop all systems

Third Trimester (Weeks 27-40)

The third trimester focuses on preparing for birth:

Week 27-28: Baby's lungs mature
Week 29-30: Baby drops into breech position
Week 31-32: Baby stores fat for after birth
Week 33-34: Baby's head engages in the pelvis
Week 35-37: Baby is considered full-term
Week 38-40: Baby gains weight and prepares for birth

Use our calculator to see the specific development for each week of your pregnancy. Remember that every pregnancy is unique, and these are general estimates.

Visual Development Guide

Seeing your baby's development through images can be incredibly helpful. Our calculator includes estimated ultrasound pictures for each week of pregnancy. These images are based on average development and may vary from baby to baby.

First Trimester Images

Early ultrasound images may show:

Week 6: Yolk sac and embryo
Week 8: Face, limbs, and heart
Week 10: Detailed facial features

Second Trimester Images

Mid-pregnancy ultrasounds typically show:

Week 16: Baby's movements and facial expressions
Week 20: Detailed limbs and body proportions
Week 24: Baby's position and surroundings

Third Trimester Images

Late pregnancy ultrasounds may reveal:

Week 30: Baby's head and body proportions
Week 34: Baby's position and surroundings
Week 38: Baby's final measurements

Remember that ultrasound images can vary greatly between babies. These are just general estimates to help you visualize your baby's development.

Frequently Asked Questions

How accurate is the pregnancy calculator?: The calculator provides general estimates based on average fetal development. For precise measurements, always consult with your healthcare provider and use ultrasound results.
When should I see an ultrasound?: Most healthcare providers recommend a first trimester ultrasound between 11-14 weeks and a second trimester ultrasound between 18-22 weeks. Late pregnancy ultrasounds are typically done between 32-36 weeks.
What factors can affect fetal development?: Several factors can influence fetal growth, including genetics, nutrition, medications, and overall health. Regular prenatal care helps monitor your baby's development.
When can I feel my baby move?: Many women first feel their baby move between 16-25 weeks, though some may feel movement earlier. If you haven't felt movement by 24 weeks, contact your healthcare provider.
What should I do if my baby's growth seems abnormal?: If you have concerns about your baby's growth, contact your healthcare provider immediately. They can schedule additional ultrasounds or other tests to monitor your baby's development.