See also:

Pregnancy fitness and nutrition

Breastfeeding

Bottle Feeding

Pregnancy/Nursing Clothing

Baby & Toddler - Parenting

Baby & Toddler: Play & Learn

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Note: A pregnancy usually lasts 38 weeks from conception, or 40 weeks from the start of your last menstrual period (LMP). If you are counting from the date of conception, just add two weeks to use this calendar. For example, if you conceived two weeks ago, you are in week 4 by the usual method.

The length of the developing baby is measured from the crown of the head to the bottom of the baby's rump, this is referred to as the CRL measurement

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Week 7

• your baby will double in size this week, from 4mm to 8mm, about the size of an M&M
• baby's heart is beginning to divide into chambers this week
• areas which will become the eyes, ears, and nose continue to develop
• arm and leg buds are present now, and by the end of the week the beginning of little hands and feet are there
• baby grows a tail that will gradually disappear as the body grows
• you may be feeling nausea, breast tenderness, or other symptoms now
• these symptoms are caused for the most part by the rush of hormones in your body
• if you are feeling nauseous, it may be a good thing, as nausea is usually associated with rising progesterone levels which are necessary to maintain a pregnancy - small comfort I know :)
• however, don't worry if you aren't nauseous or don't experience many early pregnancy symptoms - everyone reacts differently to the hormonal and physical changes that come along with growing a baby

Week 8

• little fingers are starting to form and the arms and hands continue to lengthen and develop
• baby's head has grown larger in proportion to the body
• the eyes are obvious now, as the retina develops pigment (already eye color is beginning to develop)
• at the start of this week ears are visible as little slits on the baby's head, much lower than they will be at birth
• by the end of this eight week the ears will have developed further and look quite like little baby ears
• the face is continuing to take shape, with the nose and upper lip forming this week
• baby is 13mm or about half an inch long

Week 9

• baby will grow from 13 to 18mm this week, from pinto to kidney bean size
• eyelids are beginning to develop and a little chin is visible, but still not very developed
• little arms are continuing to change, with elbows and wrists becoming more apparent
• tiny fingers are growing, but are still fused together

Week 10

• this is the most critical time in a baby's development, as the essential internal organs and other parts of the baby are forming
• it's the legs' turn to grow, with knees and toes developing
• by the end of week 10, baby is 30mm or about an inch and a quarter, like a 2-peanut shell
• upper arms get longer and the elbow bends, fingers are now distinct, but still have webbing between them
• baby's sex organs are developing, but you still can't tell if it's a boy or a girl
• baby begins to move this week, but is still too small for these movements to be felt by mommy
• if you've experienced mild nausea in the past weeks, it may start to subside now, however, everyone's different, and pregnancy-related nausea can last anywhere from a few weeks to the entire pregnancy

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Related Books:

The Pregnancy Book : A Month-By-Month Guide
by William Sears, Martha Sears, Linda H. Holt