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What Does a Fetus Look Like at 7 Weeks?

By Rose Erickson ; Updated June 13, 2017

At 7 weeks old, a fetus is far beyond the cluster of cells it started from. Even though it still has an amphibious appearance thanks to the taillike formation at the bottom of it, your baby is beginning to take on human features. The pregnancy is only in the first trimester at 7 weeks, but that doesn’t stop a parent from dreaming about what their tiny baby looks like inside the womb.

Size and Shape

Babycenter.com says that at 7 weeks old, a fetus has doubled in size from the previous week. It measures about 1/2 inch long, about the size of one blueberry. Even though this may not seem like very much, the fetus is 10,000 times larger than it was at conception. The body is shaped as a comma, but soon he will begin to straighten out and look more like a baby.

Head Features

According to Whattoexpect.com, most of the growth occurring in week 7 happens in the head. The eyes are forming and already have some pigmentation. Eyelids are almost completely developed over them. The nose has developed and little nostrils are becoming visible. The upper lip is noticeable. Inside the mouth, the tongue is beginning to grow. The ears are starting to form on the outside of the head, although they are low and not in the proper position yet.

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Internal View

Americanpregnancy.org explains that every vital organ has begun to take shape by 7 weeks. The heart has grown small bulges and pumps blood quickly through the body. Both of the brain’s hemispheres are developing. In it, new cells are growing at 100,000 cells a minute. Two kidneys are in their permanent place and begin to work. The liver is already hard at work too, creating red blood cells until bone marrow develops and takes over the duty. The appendix, pancreas and intestines are also present.

External View

The hands and feet are beginning to develop. But, as Babycenter.com states, their appearance resembles a flipper instead of fingers and toes. The tail, the end of the tailbone, is getting smaller and will soon disappear. The joints in the elbows, knees and wrists begin to show this week as well. The follicles for the hair and nipples begin to form. The skin covering the baby is very thin like parchment paper and is covered in crisscrossing blue veins.

Bones and Muscles

Babycenter.com says that the bones and muscles are developing rapidly inside the body. The muscular system is functioning, allowing the baby to kick and swim. His movements are still too tiny to be felt, though. Cells are generating rapidly as they begin to form the pairs of muscles and vertebrae that will be encased in the spinal column.

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