13 weeks pregnant
First trimester about 2 months
At 13 weeks pregnant, your baby is about the size of a peach.
Baby this week
About 70mm. The fetus can suck its thumb and make facial expressions. The vocal cords are forming, and the intestines are moving from the umbilical cord into the abdomen.
Did you know? The fetus can now suck its thumb — a reflex that's been developing for weeks and will be immediately useful after birth for feeding.
What she may be feeling
- Nausea largely resolved for most
- Energy returning
- Increased appetite
- Round ligament pain
- Growing bump
- Possible first fetal movement feelings soon
- Skin changes — linea nigra may appear
- Mild heartburn
Tips for her this week
- Welcome to the cusp of the second trimester — often called the 'golden period' of pregnancy.
- Energy typically rebounds significantly this week. Enjoy it.
- You may feel the first flutters of movement in the coming weeks — often described as bubbles or butterflies.
- Start thinking about a birth plan — not rigid, but a general sense of your preferences.
For partners
- The miscarriage risk has dropped dramatically — this is a real milestone to acknowledge.
- She should have noticeably more energy this week — the second trimester 'golden period' is beginning.
- Plan something celebratory together — a nice dinner, a weekend trip, something meaningful.
- Start seriously researching the big baby purchases: car seat, crib, stroller.
Partner to-do list
- Celebrate making it to the second trimester
- Research big baby purchases: car seat, stroller, crib
- Start drafting a birth plan conversation with your partner
- Book a babymoon trip if you're planning one — second trimester is ideal
This week together
- Plan a babymoon or celebration trip
- Start a birth plan draft
- Create or refine your baby registry
- Discuss childcare plans in more detail — daycare waitlists are long
When to call your doctor or midwife
Contact your care provider right away, or call emergency services, if she has:
- Heavy bleeding
- Severe abdominal pain
- Fever
- Reduced fetal movement (later in pregnancy this becomes more relevant)
Trusted guidance: NHS: Pregnancy · NHS: Pregnancy complications · ACOG: Pregnancy · Pregnancy Info: Your pregnancy
Common questions
How big is the baby at 13 weeks?
At 13 weeks pregnant, your baby is about the size of a peach. About 70mm.
How many months is 13 weeks pregnant?
13 weeks pregnant is about 2 months, in the first trimester.
What can partners do at 13 weeks?
The miscarriage risk has dropped dramatically — this is a real milestone to acknowledge. She should have noticeably more energy this week — the second trimester 'golden period' is beginning.