See also:

Pregnant with multiples

Breastfeeding

Bottle Feeding

Pregnancy/Nursing Clothing

Baby & Toddler - Parenting

Baby & Toddler: Play & Learn

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Note for use of this pregnancy calendar: 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 11

• your baby will be 50mm or two inches long by the end of the 9th week
• eyelids are formed and will close over eyes until around the 24th week
• baby's head is becoming more rounded and makes up half the length of your baby
• this is the beginning of the fetal period, meaning that the embryo has developed into a recognizable human being and all major systems have been formed
• fingernails and toenails start to grow

Week 12

• the ears are fully formed but are still lower than normal
• baby will be 61mm or just about 2½ inches long at the end of this week
• sex organs are noticeably male or female, but aren't fully formed yet, gender might be hard to distinguish by ultrasound at this point
• bones really start to develop around this time
• If you have a prenatal check up this week, you may be able to hear your baby's heart beat with a device called a doppler, but probably not with a regular stethoscope
• you may notice your clothes getting a little snug around the waist as the uterus rises above the pelvis

Week 13

• baby opens his mouth for the first time and may suck on a finger that gets too close
• little eyes move closer together and ears move higher up on the head, making your baby look more like he or she will at birth
• the neck continues to become more defined and straight
• your little one is growing and growing, this week it is 2.6 to 3.1 inches long and weighs around half an ounce
• you may be able to feel your uterus just above your pelvic bone as it expands to accomodate your baby, placenta, and amniotic fluid
• end of the first trimester!!

Week 14

• your baby is around 3 to 4 inches long this week and weighs around 1 to 1 and a half ounces
• little feet are half an inch long, with tiny toes that are becoming more separate as the webbing between them shrinks
• Boy or Girl? After the 12th (14th) week it is possible to determine your baby's sex via ultrasound, although it is not always foolproof, so you might want to wait on the pink paint:)
• Are you showing yet? Everyone is different, and you may show earlier if this is not your first pregnancy.

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Related Books:

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