Pregnancy week 21 - baby's development and your body

You’re now about halfway through your pregnancy! The fetus is growing stronger, and it’s common to start feeling movements around this time. With more developed senses, the fetus may even begin sucking its thumb.

Size:

The fetus is about 18 cm or 7.09 inches in size, from head to rump.

Weight:

Approximately 360 grams or 12.70 ounces.

Fetal development:

The fetus still has plenty of room in the uterus, moving its arms and legs intentionally and even performing complex movements like somersaults.

This week, the sucking reflex is developing, so the fetus may start sucking its thumb if it can reach it. Bone marrow is also beginning to develop.

Your body:

By now, your belly is often clearly visible to others, although this varies from person to person. You’ve likely started feeling the fetus’s movements, or you will soon. If it takes a bit longer, it could be due to the placenta’s position; movements are often felt later if the placenta is located at the front of the uterus.

Many experience fewer bothersome symptoms now than at the start of pregnancy, though some may feel increased ligament pressure around the uterus or begin experiencing pelvic pain as the belly grows. The skin on your belly may also feel dry and itchy as it stretches.

Other common symptoms in the second trimester include breast growth, increased appetite, back and pelvic pain, and swelling in the feet and ankles. Skin changes, such as darkened nipples or the appearance of a “linea nigra”—a dark line running from the pubic bone to just below the navel—may also occur.