Trying to get pregnant? Make sure you know the bottom line on baby-making—what you don't understand can affect your bub-to-be's health.
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What’s going on>>All systems and organs continue to grow and develop; genitals distinctly male or female.
Size>>3 1/2–4 inches long (about the size of a baseball); weighs almost 1 oz.
Looks like>>Ears and eyes have moved to their final positions.
What’s going on>> All systems and organs continue to grow and develop; cartilage being transformed into bone.
Size>>4–4 1/2 inches long; 1 3/4–2 3/4 oz. (about the size of a softball)
Looks like>>Blood vessels are visible through skin; fine hair (lanugo) covers body.
What’s going on>>Bones are hardening; fetus can smell, taste and swallow; may suck its thumb.
Size>>5 1/4–7 1/4 inches long;
7–10 1/2 ounces (about the
size of a large banana)
Looks like>>Fetus begins
to put on fat.
What’s going on>>Fetus begins swallowing more
amniotic fluid, which helps digestive system develop;
is able to hear; pregnancy is half over.
Size>>8 3/4–10 3/4 inches long;
1 1/2–3 pounds (about the size of a cantaloupe)
Looks like>>Eyebrows, eyelashes and hair on head are present; fetus looks plumper.
What’s going on>>Has sleep/wake cycles; if born now, has a chance of surviving; at about 24 weeks, appears
to recognize parents’ voices.
Size>>11 3/4–13 1/4 inches long (20 1/4 inches including legs); 3 1/2–5 1/2 pounds (about the size of a basketball)
Looks like>>Fetus is chubbier, more babylike.
What’s going on>>Fetus makes purposeful movements to get comfortable; lungs (among last organs to develop fully) continue maturing.
Size>>20 3/4–21 1/2 inches long; 6–7 1/2 pounds (about the size of a medium watermelon!)
Looks like>>Fetus is bigger and very newborn-like.
What’s going on>>In 97 percent of pregnancies, fetus begins to move into delivery position; by week 37, lungs
are developed; by week 38,
is ready to be born.
A GLOSSARY of terms Zygote stage: the first week after fertilization Blastocyst stage: weeks 1–2 after fertilization Embryonic stage: weeks 2–8 after fertilization Fetal stage: weeks 9–38
THOSE UNFORGETTABLE FIRSTS
Here’s what kind of action to expect from within, and when:
((First heartbeat)) Your baby’s heart starts beating a few weeks after conception, but you’ll have to wait until about the 12th week of pregnancy to hear it.
((First kicks, aka quickening)) You’ll feel these anywhere from 16 to 20 weeks of pregnancy, depending on the fetus’ size, activity level and other factors.