Week 17
Trimester 2Days 16+0 to 16+6
Baby is now the size of a carrot
Welcome to Week 17. Your baby is growing quickly and becoming stronger every day. Many mothers begin feeling more connected to their baby around this stage, especially if they start noticing those first unmistakable little movements. For many women, the second trimester continues to be a relatively comfortable period. Your baby is busy developing stronger bones, more coordinated movements, and increasingly sophisticated body systems.
Length
~13 cm
~5.1 in
Weight
~140 g
~308.6 lb
Development highlights
- check_circleMuscles and bones continue developing rapidly — movements are becoming more powerful and coordinated.
- check_circleThe skeleton continues hardening through ossification as cartilage becomes bone.
- check_circleA very small amount of body fat is beginning to form beneath the skin to help regulate temperature and store energy.
- check_circleHearing structures continue becoming more advanced — your baby may begin detecting sounds from inside your body such as your heartbeat.
- check_circleThe umbilical cord continues growing and strengthening, delivering oxygen, nutrients, and hormones.
This week's milestones
- check_circleFirst body fat beginning to form.
- check_circleHearing structures becoming more advanced.
- check_circleSkeleton hardening rapidly.
- check_circleMovements increasingly powerful.
Fun fact
Your baby may already have a unique pattern of fingerprints and tiny movements that are entirely their own.
Weekly checklist
- Continue prenatal vitamins.
- Stay hydrated.
- Eat balanced meals.
- Stay active.
- Pay attention to possible baby movements.
- Attend scheduled appointments.
Frequently asked questions
Is it normal not to feel movement yet?
Yes. Many first-time mothers do not feel movement until Weeks 18 to 22.
What do early baby movements feel like?
They are often described as flutters, bubbles, butterflies, or tiny taps — easily mistaken for digestion at first.
Why am I having strange dreams?
Hormonal changes and emotional processing during pregnancy can lead to vivid dreams. This is very common.
Is my baby able to hear me?
Your baby is beginning to develop hearing, but sounds are still very muffled at this stage.
Related tools
shopping_bagHelpful picks for Trimester 2
Browse all pregnancy products →Momcozy Maternity Pregnancy Pillow
Full-length maternity pillow for bump support and back relief — great from the second trimester onward.
Kindred Bravely Maternity Compression Socks
Graduated compression socks to reduce swelling and relieve tired legs — great from the 2nd trimester onward.
Palmer's Cocoa Butter Stretch Mark Lotion
A trusted daily moisturizer for stretch mark prevention during pregnancy with vitamin E and collagen.
Some links are affiliate links. We may earn a small commission at no extra cost to you.
Explore more
Medical information disclaimer
The content on this page is provided for general informational and educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.
Always consult your GP, midwife, health visitor, paediatrician, or other qualified healthcare provider before making decisions about your health or your child's health and development. Never ignore or delay seeking professional advice because of something you have read on BabyScout. If you think there is a medical emergency, call 999 (UK) or your local emergency services immediately.