18 weeks pregnant baby size
By Pregora Editorial Team · Updated 2026-05-07 · 3 min read

At 18 weeks pregnant, your baby is about 14.2 cm / 5.6 in long and weighs around 190 g / 6.7 oz — comparable in size to a bell pepper. About the size of a bell pepper — kicks may start to feel real.
Length
14.2 cm / 5.6 in
Weight
190 g / 6.7 oz
Size of
Bell pepper
Week 18 milestones
- First-time mothers often feel 'quickening' (first kicks) around now
- Baby's hearing is developing — they can hear muffled sounds
- Bones are hardening through ossification
- Sex organs are clearly visible on ultrasound
Tip for week 18
Talk or sing to baby — they can hear your voice. Studies show babies recognise their mother's voice at birth.
Related calculators & pages
Disclaimer: Baby measurements are population averages — individual babies vary. Always consult your healthcare provider for personalised growth assessments based on your ultrasound scans.
Related tools
Due Date Calculator
Estimate your pregnancy due date from last period, conception, ultrasound, or a known due date.
Pregnancy Week Calculator
How far along am I? Find your current week, trimester, and major pregnancy milestones.
Ovulation Calculator
Find your fertile window, peak ovulation day, and next 6 ovulation dates from your last period.
Conception Calculator
Find when you most likely conceived from your last period, due date, or ultrasound.
Reverse Due Date Calculator
Already have a due date? Work backward to find conception date, LMP, and pregnancy timeline.
IVF Due Date Calculator
Calculate due date from embryo transfer — Day 3, Day 5, Day 6 transfers and FET cycles.
FET Due Date Calculator
Frozen embryo transfer due date — Day 3, Day 5, Day 6 FET cycles using fertility-clinic math.
Trimester Calculator
What trimester am I in? Find your current trimester (1st, 2nd, or 3rd) and trimester boundaries.
Implantation Calculator
When does implantation happen? Find your implantation window (6-12 days after conception) and earliest test date.
Pregnancy Test Calculator
When can I take a pregnancy test? Earliest reliable date for standard, early-detection, and blood tests.
Chinese Gender Predictor
Predict baby gender using the traditional 24×12 lunar age chart. For entertainment only — not science.
Pregnancy Weight Gain Calculator
Healthy weight-gain range based on pre-pregnancy BMI and current week, using IOM guidelines.