Baby is about the size ofA sesame seed
LengthAbout 2 mm
WeightLess than 1 g
Week 5 of 40, first trimester35 weeks to go
Your baby at 5 weeks
The neural tube, which becomes the brain and spinal cord, is forming. This is why folic acid is so important now. The heart is developing as a simple tube and its cells begin to pulse.
Your body at 5 weeks
Early symptoms often appear: tender or swollen breasts, needing to pass urine more often, tiredness and, for many, the start of nausea.
Your checklist this week
- Book your first pregnancy appointment if you have not already.
- Learn which foods to avoid, such as unpasteurised cheese, raw or undercooked meat and fish high in mercury.
- Tell your doctor about any medicines, including herbal remedies.
Not sure which week you are in?
Use our Due Date Calculator or Pregnancy Week Calculator to find out exactly how far along you are.