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Pregnancy Week by Week: How Big Is Your Baby This Week?

9 min


A tiny life is growing in your womb. It makes its presence felt with kicks and movements. While you get to have a glimpse of your baby during the ultrasounds, you do not get a clear picture of its size. As a to-be-mom, you would be curious to know how big your baby is. MomJunction gives you week-by-week details on the size of your baby.

Week-By-Week Baby Size:

Here, we compare the baby’s size with that of a fruit, so that you can let your imagination loose, and begin drawing a picture of your baby.

Weeks 1 to 3

The size of the baby is not measurable during this period.

Ovulation takes place during week one and is followed by fertilization in the week two. By week three, your baby is a blastocyst (a ball of multiple cells) that gets attached to the uterine lining, confirming your pregnancy. However, you might not know about your pregnancy until you miss your period.

Week 4:

Your baby is an embryo and about the size of a poppy seed. The embryo is made of 32 cells, which separate into three distinct layers that further develop into a body structure. Nausea and indigestion are common in this week.

Length: 0.1cm (0.04in)
Weight: Less than 1g (0.035oz)

Week 5:

The baby is about the size of a peppercorn. You may start experiencing the early symptoms of pregnancy, such as breast tenderness, headaches, and morning sickness. The development of the heart, spinal cord, brain, and blood vessels begin in the baby during this week.

Length: 0.1cm (0.04in)
Weight: Less than 1g (0.035oz)

Week 6:

Your baby is about the size of a pomegranate seed. By this week, your baby has leaped in size and is well protected by the amniotic sac. An ultrasound helps you listen to the first sign of life — your baby’s heartbeat. Kidneys and liver also start developing. For expectant mothers, mood swings, fatigue, aversion to food and smells are common in this week.

Length: Around 1cm (0.4in)
Weight: Less than 1g (0.035oz)

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