Here, learn about the average weight of a baby from birth to 1 year of age. We also explore factors that affect weight and additional milestones.

The average fetus at 13 weeks is 2.6 inches (6.7 cm) long and weighs about 2.6 ounces (73 grams). All major organs are formed now, but they are too immature for the fetus to survive out of the womb.

You're pregnant. Congratulations! As your pregnancy goes on, you may wonder how your baby is growing and developing. Use this information to follow along with what's happening week by week …

At 20 weeks pregnant, your baby is the size of a sweet potato. During your second trimester ultrasound, you can find out whether it's a boy or a girl.

At 10 weeks pregnant, your baby is the size of a prune and is officially a fetus. Your baby is starting to build bones and cartilage, and tiny teeth are forming.

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At 20 weeks, you've reached the halfway point in your pregnancy! Use BabyCenter's week-by-week guide to learn more about pregnancy at 20 weeks.

At 6 weeks, your baby is the size of a lentil and you may begin to have morning sickness. Learn more about what to expect at 6 weeks pregnant.