How Your Baby Grows
To get a rough idea of when your baby is due visit Due Date Calculator (SOGC).
Your due date is a best guess – most babies are born within two weeks before or after your due date.
The FIRST trimester (Weeks 1 to 12)
By the end of the first trimester:
- The placenta, the umbilical cord, and all of baby’s organs have formed.
- Baby’s heart is beating. The heartbeat can be detected by ultrasound at around 6 weeks.
- The face is forming and includes ears, a nose, and eyes which are closed.
- The arms, legs, fingers, and toes have appeared.
- The brain is growing quickly.
The SECOND trimester (Weeks 13 to 27)
By the end of the second trimester:
- The external genitals are well developed.
- Baby’s eyes can open and sense light.
- Other senses develop – your baby can hear!
- The heartbeat can be heard by your health care provider using a hand-held device called a doppler.
- Baby is using muscles to move and kick.
- Baby can have hiccups.
- Baby is able to suck and you may even find him sucking his thumb on an ultrasound!
- Baby is covered with a protective white cream (vernix) and fine hairs (lanugo).
- The lungs are developed but not able to function yet.
The THIRD trimester (Weeks 28 to Birth)
By the end of the third trimester:
- The skin becomes less wrinkled as baby gains weight more quickly.
- Baby won’t be doing somersaults anymore but you should still feel frequent movement.
- Baby sleeps and wakes regularly.
- The lungs and brain mature.
- Baby usually turns into a head-down position for birth.
Conception to Birth Visualized (fragment) TED Talk