Pregnancy Development Stages

Pregnancy is divided into three distinct stages: the first trimester, second trimester, and third trimester. Vital fetal growth and development happens in each of them, and your body also changes along the way. Check out our guide on pregnancy stages to learn about ultrasounds, important prenatal tests, fetal development, health concerns, about more.

Most Recent

Your Growing Baby Bump: Month by Month

By the end of your pregnancy, your baby will be the size of a watermelon. See how your little one's growth affects your bump during each month of gestation.

How Big Is Your Baby in Third Trimester?

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the third trimester.

How Big Is Your Baby in Second Trimester?

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the second trimester.

How Big Is Your Baby in First Trimester?

Wonder how big your baby is now? Here's an approximate look at size, weight and height in the first trimester.

What is Rhesus Disease and How Does it Affect Pregnancy?

If you don’t have the “Rh factor” in your blood, you risk having a baby with rhesus disease (Rh disease). Here’s what you need to know about being Rh-negative in pregnancy.

Ultrasounds

How Many Ultrasounds Do You Need During Pregnancy?

As it turns out, most women only need a couple of ultrasounds during pregnancy. Read on to learn more about these important prenatal exams.

First Trimester Ultrasound Pictures

Do you know what to expect at your first trimester ultrasound? We've partnered with the American Institute of Ultrasound Medicine (AIUM), Johns Hopkins, and the March of Dimes to create this unique peak into Baby's development inside the womb during the first few weeks of life. 

Pregnancy Trimester Guides


What to Expect in the First Trimester

For most women, the initial weeks of pregnancy are the most consuming because everything is new, exciting, and a bit overwhelming. Consider this your manual for understanding the first trimester.