Week 18
Your baby is the size of a Bell pepper
Baby Size
Bell pepper
Length
5.6 in (14.2 cm)
Weight
6.7 oz (190 g)
Trimester
Second Trimester
Your Baby at Week 18
Your baby is the size of a bell pepper at 18 weeks. A remarkable milestone this week: your baby can now hear! Your voice, your heartbeat, and the sounds of your body are becoming familiar.
Key milestone: The baby can hear sounds. Myelin (nerve insulation) begins forming. The immune system develops.
Your Symptoms
Increased appetite. You may feel more defined movements. Backaches may begin.
Tip for This Week
Talk or sing to your baby — they can hear your voice now!
Your Body at Week 18
The second trimester brings a welcome shift — your energy returns as hormone levels stabilize. Your uterus is now rising above the pubic bone, and your baby bump is becoming noticeable. Increased blood flow may give you that 'pregnancy glow,' but it can also cause nasal congestion and gum sensitivity.
Your baby at week 18 is the size of a Bell pepper, measuring about 5.6 in (14.2 cm) and weighing roughly 6.7 oz (190 g). Your baby is becoming more active, and you may notice patterns in their movements — especially after meals or when you're resting.
Your Baby's Development This Week
Your baby is the size of a bell pepper at 18 weeks. A remarkable milestone this week: your baby can now hear! Your voice, your heartbeat, and the sounds of your body are becoming familiar. The key milestone this week is that the baby can hear sounds. myelin (nerve insulation) begins forming. the immune system develops.
The second trimester is when pregnancy becomes more tangible. Your baby's movements grow from subtle flutters to definite kicks, and their senses are awakening to the world outside. This is a beautiful time to begin bonding practices like daily voice notes.
This week's voice theme
“Listening to your voice — the sweetest sound in the world.”
Imagine hearing this every morning — a voice note from your baby that evolves week by week.
Hear your baby's voice →Frequently Asked Questions
What can my baby hear at 18 weeks?
Your baby can hear your voice, heartbeat, and stomach sounds. Loud external noises may also be heard.
Should I play music for my baby?
While your baby can hear, your voice is the most meaningful sound. Talking or singing helps bonding.