Morning sickness is still rampant and you're exhausted; this begins the third month of your pregnancy. Although you're barely showing much in the way of a baby bump, your baby is working day and night on his development, and already has all of the necessary tissues and organs that he'll need outside of the womb. While you can't take a peek inside your belly in any way other than an ultrasound, staying on top of your baby's development and knowing what he looks like can help you feel more connected to him.
Size
A 3-month-old fetus is roughly 2 1/2 to 3 inches long, notes Sutter Health. About the size of a domino playing piece, your tiny baby is growing about a quarter inch per week. You might still be in awe of how something so tiny can make you feel so awful. Luckily, as the third month gives way into the second trimester in month four, you'll begin to feel better.
Weight
Because your fetus is so small, it's hard to measure weight. The Mayo Clinic doesn't start counting weight until week 12, or the end of your third month. At this time, your baby weights about half of an ounce and can be compared to a small lime.
Organs
Your baby's intestines began to grow so fast in your third month that they protrude into the umbilical cord, notes BabyCenter.com. In week 12, they'll begin to settle back into the abdominal cavity to where they will rest. Her heart is beating at around 150 beats per minute, and her heartbeat is usually first detected at the 10-week mark by your obstetrician and his fetal Doppler. Genitalia develops by week 11, but you still won't be able to tell the sex of your baby for a few more weeks, if you so choose. Most all of her other organs and tissues are already developed by the end of the third month.
Physical Appearance
While your tiny baby still doesn't look like the round, bouncing baby boy that he'll look like outside of the womb, his arms, legs, fingers and toes are all fully developed. His face looks more human. Although his ears are still pinned quite tightly against his head, his eyes have moved closer together on his face. His eyelids are fully formed over his eyes, although they will remain shut for the duration of the pregnancy.
Movement
Your baby begins to flip and squirm around your uterus around the 12-week mark, although unless you're carrying twins or are very sensitive, you won't feel it until after 16 weeks. Her fingers and toes can curl, and her mouth can suck and clench. She's beginning to exhibit some of the instinctual reflexes she'll have when born, like automatically sucking for food.
