Your baby is conceived
April 29, 2026
Baby's Size This Week
Week 5
Sesame seed
Your baby is about the size of a sesame seed this week
Baby Status
Heart Rate
80-103 bpm
Listen to Your Baby's Heartbeat
Week 5 - Your baby's heart beats with life
91
BPM
Pregnancy Achievements
Heartbeat Hero
Week 6 - Heart starts beating
Tiny Human
Week 10 - All organs formed
1st Trimester Champion
Week 13 - First trimester complete
Halfway There!
Week 20 - 50% complete
Viability Victory
Week 24 - Baby could survive outside womb
Dream Weaver
Week 28 - REM sleep & dreaming begins
Significant Milestones in Embryo/Fetal Development
✨
Week 2
🧪
Positive pregnancy test
May 13, 2026
Week 4
❤️
Organs begin to form, heart starts beating
May 20, 2026 - You are here
Week 5
🩺
Major organs have formed, heart can be heard
June 24, 2026
Week 10
🛡️
Second trimester, risk of miscarriage decreases
July 08, 2026
Week 12
📢
Now is a good time to announce your pregnancy
July 22, 2026
Week 14
👁️
Your baby can now see light
July 29, 2026
Week 15
🔍
Your baby's gender is visible on ultrasound
August 05, 2026
Week 16
🤰
You can feel your baby move around
August 19, 2026
Week 18
👂
Your baby can now hear sounds
August 26, 2026
Week 19
🏥
Premature babies have a chance to survive
September 23, 2026
Week 23
🌬️
Third trimester, your baby can breathe
October 21, 2026
Week 27
💅
Fingernails and toenails have formed
November 25, 2026
Week 32
✅
Your baby is now considered full term
December 30, 2026
Week 37
🎉
Your baby is due any time now!
January 20, 2027
Week 40
Weekly Development Progress
Week 5 of pregnancy is a huge week for your baby for a number of reasons. Firstly, the placenta is now firmly attached to your uterine wall, and becomes essentially a whole new organ (it doesn't stay forever though; it will detach and be delivered shortly after your baby arrives). Although the placenta is still developing, it's finally up and running as of this week, and provides oxygen and nourishment for your baby.
The placenta is also vital for a whole other reason, and that's to try and prevent any potentially harmful substances from reaching your baby, whether that be infection or, believe it or not, even your own blood.
Video & Ultrasound Pictures
Video
Development Week 5 Video
What Your Baby Can Hear
Your baby's ears are still developing. At week 5, the inner ear structures are forming. Baby will begin hearing around week 18.
Hearing Development Timeline
Week 6
Inner ear begins forming
The cochlea and vestibular system start developing from the otic placode.
Week 16
Ears reach final shape
The outer ears are now fully formed and in their correct position on the head.
Week 18
First sounds detected
Baby begins to hear internal sounds: your heartbeat, blood flow, and digestive system.
Week 22
Responds to voices
Baby can hear your voice and may respond to it with movement. They prefer low-pitched sounds.
Week 25
Reacts to music
Baby can hear music and external sounds. Studies show babies prefer classical and soft music.
Week 27
Startles at loud noise
The auditory system is mature enough to startle at sudden loud sounds.
Week 32
Recognizes your voice
Baby can distinguish your voice from others and shows a preference for it after birth.
Week 35
Remembers music
Research shows babies can remember and recognize melodies heard in the womb after birth.
Want to recalculate? Go back to the calculator.