| Week 1 |
May 3, 2026 - May 9, 2026 |
First |
- |
| Week 2 |
May 10, 2026 - May 16, 2026 |
First |
- |
| Week 3 |
May 17, 2026 - May 23, 2026 |
First |
Baby conceived (fertilization) |
| Week 4 |
May 24, 2026 - May 30, 2026 |
First |
Blastocyst implants in uterus |
| Week 5 |
May 31, 2026 - Jun 6, 2026 |
First |
Heart and circulatory system form |
| Week 6 |
Jun 7, 2026 - Jun 13, 2026 |
First |
Heart begins beating |
| Week 7 |
Jun 14, 2026 - Jun 20, 2026 |
First |
Arm and leg buds emerge |
| Week 8 |
Jun 21, 2026 - Jun 27, 2026 |
First |
Facial features begin forming |
| Week 9 |
Jun 28, 2026 - Jul 4, 2026 |
First |
Essential organs start developing |
| Week 10 |
Jul 5, 2026 - Jul 11, 2026 |
First |
Embryonic stage ends, fetal period begins |
| Week 11 |
Jul 12, 2026 - Jul 18, 2026 |
First |
Fingers and toes separate |
| Week 12 |
Jul 19, 2026 - Jul 25, 2026 |
First |
Reflexes begin, kidneys produce urine |
| Week 13 |
Jul 26, 2026 - Aug 1, 2026 |
Second |
Vocal cords develop, fingerprints form |
| Week 14 |
Aug 2, 2026 - Aug 8, 2026 |
Second |
Thyroid gland matures |
| Week 15 |
Aug 9, 2026 - Aug 15, 2026 |
Second |
Sensory nerves connect |
| Week 16 |
Aug 16, 2026 - Aug 22, 2026 |
Second |
Eyes can make subtle movements |
| Week 17 |
Aug 23, 2026 - Aug 29, 2026 |
Second |
Skeleton hardens from cartilage to bone |
| Week 18 |
Aug 30, 2026 - Sep 5, 2026 |
Second |
Baby can hear maternal sounds |
| Week 19 |
Sep 6, 2026 - Sep 12, 2026 |
Second |
Vernix caseosa protects skin |
| Week 20 |
Sep 13, 2026 - Sep 19, 2026 |
Second |
Halfway mark! Anatomy ultrasound |
| Week 21 |
Sep 20, 2026 - Sep 26, 2026 |
Second |
Bone marrow produces blood cells |
| Week 22 |
Sep 27, 2026 - Oct 3, 2026 |
Second |
Sense of touch develops |
| Week 23 |
Oct 4, 2026 - Oct 10, 2026 |
Second |
Rapid eye movement (REM) sleep begins |
| Week 24 |
Oct 11, 2026 - Oct 17, 2026 |
Second |
Viability milestone outside womb |
| Week 25 ★ |
Oct 18, 2026 - Oct 24, 2026 |
Second |
Capillaries form in skin |
| Week 26 |
Oct 25, 2026 - Oct 31, 2026 |
Second |
Air sacs in lungs develop |
| Week 27 |
Nov 1, 2026 - Nov 7, 2026 |
Third |
Third trimester begins, eyes open |
| Week 28 |
Nov 8, 2026 - Nov 14, 2026 |
Third |
Brain tissue develops complex grooves |
| Week 29 |
Nov 15, 2026 - Nov 21, 2026 |
Third |
Muscles and lungs continue maturing |
| Week 30 |
Nov 22, 2026 - Nov 28, 2026 |
Third |
Body fat increases rapidly |
| Week 31 |
Nov 29, 2026 - Dec 5, 2026 |
Third |
Central nervous system controls temperature |
| Week 32 |
Dec 6, 2026 - Dec 12, 2026 |
Third |
Fingernails reach fingertips |
| Week 33 |
Dec 13, 2026 - Dec 19, 2026 |
Third |
Antibodies pass from mother to baby |
| Week 34 |
Dec 20, 2026 - Dec 26, 2026 |
Third |
Surfactant in lungs matures |
| Week 35 |
Dec 27, 2026 - Jan 2, 2027 |
Third |
Kidneys fully developed |
| Week 36 |
Jan 3, 2027 - Jan 9, 2027 |
Third |
Early term approaching, baby drops lower |
| Week 37 |
Jan 10, 2027 - Jan 16, 2027 |
Third |
Early term (organs fully functional) |
| Week 38 |
Jan 17, 2027 - Jan 23, 2027 |
Third |
Grip becomes firm |
| Week 39 |
Jan 24, 2027 - Jan 30, 2027 |
Third |
Full term milestone |
| Week 40 |
Jan 31, 2027 - Feb 6, 2027 |
Third |
Estimated Due Date! Welcome baby! |