Trimester 1
Week 5
About the size of
a sesame seed
~0.2 cm
Averages only: a scan is the only way to know your baby’s size.
Your baby this week
The neural tube is closing along the back, and the earliest heart tissue begins to pulse: often before it can be seen on a scan.
What you may feel
Rising hCG can bring on nausea, a heightened sense of smell and real exhaustion. Some people feel nothing at all, which is equally normal.
This week, try
Eat something small before getting out of bed. An empty stomach makes early nausea noticeably worse.
Weeks are counted from the first day of your last period, as your care team counts them. Written by The Childhood Journal’s team from standard prenatal references. Not yet reviewed by a clinician: our scientific board is being formed. General information, never an assessment of your pregnancy.