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Pregnancy Week by Week

Get a window on what’s happening in your pregnancy, week by week. From week four to week 42, your baby is experiencing a miraculous transformation from a clump of cells to a fully formed (and totally cute) newborn. Just imagine, as early as five weeks, your baby is already starting to form major organs (heart, stomach, liver, and kidneys) and systems (digestive, circulatory, nervous). By eight weeks, your raspberry-sized womb-mate is moving her arms and legs. At the beginning of your second trimester (week 14), your wee one is sucking his thumb. By week 28, the first week of the third trimester, baby (now as big as an eggplant) is prepping for breathing, developing his eyesight and packing on pounds in anticipation of life outside the womb. Each week is a new miracle. Less miraculous is how a mom-to-be may feel. Pregnancy Week-by-Week charts your baby’s development but also lets mom know what she might be feeling during each week of her pregnancy. Pregnancy week by Week includes everything mom needs to know to feel a sense of control over her pregnancy. Each week offers a complete guide to what you might feel, your must-do’s, your nice-to do’s, and answers and advice on everything pregnancy-related. Plus each week’s guide offers tips on maintaining a healthy and comfortable pregnancy from strategies on coping with pregnancy symptoms (morning sickness anyone?) to ideas for healthy eating, and pointers on talking to your OB. Let us guide you along your pregnancy, week by week.

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you asked...

What is the difference between an embryo and a fetus?

Baby was an embryo and is now a fetus. What does that mean?

Re:

Baby was an embryo and is now a fetus. What does that mean?

The Bump Expert

It’s a different phase of baby’s development. “The embryo is defined as the developing pregnancy from the time of fertilization until the end of the eighth week of gestation, when it becomes known as a fetus,” says James A. O’Brien, MD, ob-gyn, medical director of inpatient obstetrics at Women & Infants Hospital of Rhode Island.

During the embryonic period, cells begin to take on different functions. The brain, heart, lungs, internal organs, and arms and legs begin to form. Once baby is a fetus, it’s more about growth and development to prep for life on the outside.

Plus, more from The Bump:

What Is Implantation Bleeding?

Most Common Symptoms of Pregnancy

First Trimester To-Dos

James A. O’Brien, MD, ob-gyn, medical director of inpatient obstetrics at Women & Infants Hospital of Rhode Island

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