Your First Trimester

Weeks 1-12

The first trimester is a busy time. Your baby will go through important stages of development, and you’ll experience many changes of your own. You’ll probably feel excited, curious, exhausted, and, well, pregnant. But you definitely won’t be bored. Be sure to take good care of yourself, rest when you need to, and learn as much as you can during these action-packed 12 weeks.  Need more care?  Learn about our VIP OB services!

Weeks 1-4

Your baby
During this time, the egg travels to your uterus, where your baby will grow and develop. Things are happening fast — by 4 weeks, your baby’s heart, brain, and lungs are already forming. Eye development begins at this stage, when optic nerves appear on each side of your little one’s head.


Your body

If you know you’re between 1 and 4 weeks pregnant, you found out earlier than most women do. Do you feel any different? This early in your pregnancy, the answer is probably no. You may experience tender breasts, nausea, and fatigue — similar to how you feel right before you start your period. No changes yet? No worries. Many women don’t start to “feel pregnant” until they’re a little further along.

Weeks 5-8

Your baby

Is about the size of a grain of rice.
A long tube is developing that will eventually become the spinal cord and brain.
There’s a tiny lump in the center of the embryo that will soon become your baby’s heart.
The placenta that will nourish your growing baby has formed.

Over these next few weeks, your baby will grow to be about 1 inch long and develop arms, legs, muscles, and skin. If you could see your little one, you’d notice that the head is much bigger than the rest of his or her body, because your baby’s brain is growing faster than any other organ.

Your body

You may start to notice early signs of pregnancy: Feeling tired, tender breasts, and nausea are all common. So are craving new foods and suddenly being disgusted by foods you used to love. Your sense of smell might be in overdrive — some women can’t even stand the smell of their favorite flowers during pregnancy. All of this is normal, and temporary.

Feeling moody? That’s your hormones working overtime. And with so many changes happening in your life, it’s natural to feel many different emotions. Talking things over with a trusted friend can help you handle the ups and downs.

Your to-do list
Schedule your first prenatal care visit. We typically recommend having your first prenatal appointment between weeks 7 and 12.
If you take medication, ask your doctor if it’s okay to keep taking it while you’re pregnant.
Get lots of rest. Fatigue is very common in early pregnancy. Take it easy when you need to.

Weeks 9-12

Your baby

Is about the size of a grape.
Tiny buds are forming that will someday become teeth.
Eyelids have formed to cover your little one’s eyes.

Your little one is moving around, but you might not feel it just yet. Believe it or not, most critical development is already complete. By the end of week 12, your baby will be 2 to 3 inches long and weigh about 1 ounce. Grow, baby, grow!
If you haven’t had your first prenatal appointment yet, make sure you schedule it! We’ll want to see you — and your baby, via ultrasound — sometime between weeks 7 and 12.

Your body

You may not have a baby bump yet, but you probably feel pregnant by now. For some moms-to-be, this is when morning sickness is at its worst. If you’re struggling, try these tips for managing morning sickness. Over the next 4 weeks, your uterus will go from weighing about 1 ounce to more than 2 pounds. You might feel some cramping as it expands to make room for your little one.

Speaking of growing, are your clothes getting tight? You’ll probably need a more supportive bra in a bigger size soon. Right now anything with an elastic waistband is your friend — but if you want to wear your favorite jeans a little longer, use a rubber band to add an inch or two. Just loop the band around the button, pull one end through the buttonhole, and loop that end back around the button.

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