5 Weeks Pregnant: Baby Size, Development & Symptoms
| Baby's size | About the size of a sesame seed |
| Length | about 2 mm |
| Weight | under 1 g |
| Trimester | First trimester, month 2 |
Your baby this week
The neural tube, which becomes the brain and spinal cord, is forming, and a simple heart begins to develop.
Your body this week
Tiredness, tender breasts and needing to pass urine more often are common.
Tip of the week
Book your first antenatal appointment.
Quick answers
How big is my baby at 5 weeks?
About the size of a sesame seed: around 2 mm long and under 1 g.
How many months is 5 weeks pregnant?
5 weeks is in month 2 of pregnancy, in the first trimester.