Pregnancy Calculator | Baby Milestones & Due Date
🤰 Pregnancy Calculator & Baby Milestones
Calculate your due date based on your last menstrual period (LMP) and track your baby's amazing growth journey! 🌸
🤰 Comprehensive Guide to Pregnancy Milestones and Baby Development
Pregnancy is a remarkable journey filled with anticipation, transformation, and profound growth. Understanding each stage of this journey can empower expectant parents, providing clarity and connection to the life developing within. This guide offers an in-depth week-by-week breakdown of pregnancy milestones, aligning with World Health Organization (WHO) standards, to support you through each phase.
📅 First Trimester (Weeks 1–13)
Week 1–2: Preparation and Ovulation
Overview: The body prepares for ovulation and potential fertilization. Hormonal changes prime the uterus for pregnancy.
Development: While not pregnant yet, the uterine lining thickens, and an egg matures in the ovaries.
Week 3: Fertilization
Overview: Ovulation occurs, and if sperm meets the egg, fertilization happens in the fallopian tube.
Development: A zygote forms and begins dividing rapidly, preparing for implantation.
Week 4: Implantation
Overview: The fertilized egg (blastocyst) implants in the uterine lining.
Development: hCG hormone is released, signaling the body to maintain the uterine lining.
Week 5: Embryonic Development Begins
Overview: Pregnancy is now detectable with a test.
Development: The neural tube begins forming, and the heart and circulatory system start to develop.
Week 6: Heartbeat Detection
Overview: The embryo is about the size of a lentil.
Development: The heart begins to beat and can sometimes be detected via ultrasound.
Week 7: Rapid Growth
Overview: Major organs continue forming.
Development: Arms and legs begin budding; facial features are becoming more defined.
Week 8: Facial Features Form
Overview: Your baby is now called a fetus.
Development: Eyes, nose, and lips are forming; fingers and toes begin appearing.
Week 9: Movement Begins
Overview: Tiny movements may begin, though you won't feel them yet.
Development: Muscle and nerve development enables spontaneous movement.
Week 10: Vital Organs Function
Overview: The embryo officially becomes a fetus.
Development: Brain development accelerates; kidneys, intestines, and liver start functioning.
Week 11: Genitals Develop
Overview: The baby is about 2 inches long.
Development: External genitalia begin to form, but sex is still hard to determine by ultrasound.
Week 12: Fingernails and Toes
Overview: You may start feeling more energetic.
Development: Fingernails, toenails, and vocal cords develop; reflexes kick in.
Week 13: End of First Trimester
Overview: Miscarriage risk significantly drops.
Development: Organs are formed and functioning; baby is about 3 inches long.
🤰 Second Trimester (Weeks 14–27)
Week 14: Facial Expressions
Overview: You may see a little bump!
Development: Baby can frown, squint, and make facial movements.
Week 15: Hearing Develops
Overview: Bones are becoming harder.
Development: Ears move to their final position and baby may begin to hear.
Week 16: Gender Reveal Possible
Overview: You might be able to find out the baby’s sex via ultrasound.
Development: Limb coordination improves and facial muscles are active.
Week 17: Fat Accumulation
Overview: Baby’s skin is still transparent.
Development: Fat stores begin to accumulate beneath the skin.
Week 18: Nervous System Matures
Overview: You may start to feel flutters.
Development: Nerves begin to form a protective sheath (myelin).
Week 19: Vernix Caseosa Forms
Overview: Baby’s senses are developing.
Development: Vernix (waxy protective coating) covers the skin.
Week 20: Halfway Point
Overview: Anatomy scan often occurs now.
Development: All major organs are in place and further developing.
Week 21: Taste Buds Develop
Overview: Baby can now taste the amniotic fluid.
Development: Digestive system is maturing.
Week 22: Hair Growth
Overview: Baby is about 11 inches long.
Development: Hair becomes visible; eyelids and eyebrows form.
Week 23: Lung Development
Overview: Baby is more active.
Development: Lungs produce surfactant; baby practices breathing Certainly! Here is the continued week-by-week guide from Week 24 to Week 40, completing the entire pregnancy timeline, still aligned with WHO standards and written in a parent-friendly tone: ---
Week 24: Response to Sound
Overview: Baby is increasingly responsive.
Development: Baby hears external sounds and may move in response. Lungs continue maturing.
Week 25: Nervous System Matures
Overview: Baby’s reflexes are developing.
Development: Hands can make a fist, and nerves are growing rapidly.
Week 26: Eyes Open
Overview: Eyes begin to open and blink.
Development: Retinas are developing; baby may react to bright light.
Week 27: End of Second Trimester
Overview: Baby weighs around 2 pounds.
Development: Sleep and wake cycles begin forming; brain activity increases.
👶 Third Trimester (Weeks 28–40)
Week 28: Brain and Lung Growth
Overview: Welcome to the third trimester!
Development: Brain and lungs undergo significant development; eyes can now see dim light.
Week 29: Increased Fat Storage
Overview: Baby’s body is filling out.
Development: Muscles and lungs continue maturing; fat layers develop under the skin.
Week 30: Stronger Movements
Overview: You may notice more defined kicks.
Development: Bone marrow begins to produce red blood cells.
Week 31: Sensing the World
Overview: Baby’s senses are active.
Development: Eyesight, hearing, and touch are refined; baby can process sounds and light changes.
Week 32: Steady Weight Gain
Overview: Baby weighs about 4 pounds.
Development: Organs mature, and baby practices breathing and sucking.
Week 33: Skull Flexibility
Overview: Preparing for delivery.
Development: Skull bones remain soft and flexible for easier passage through the birth canal.
Week 34: Skin Becomes Smoother
Overview: Baby looks more like a newborn.
Development: Vernix thickens; baby may shift to head-down position.
Week 35: Kidney and Liver Readiness
Overview: Baby’s organs are nearly fully developed.
Development: Liver processes waste, and kidneys are fully developed.
Week 36: Getting Into Position
Overview: Baby usually turns head-down now.
Development: Skull is still soft; limbs may appear chubby.
Week 37: Early Term
Overview: Baby is considered early term.
Development: Lungs and brain continue to mature. Baby prepares for birth by shedding vernix and lanugo.
Week 38: Final Touches
Overview: Baby’s organs are ready for the outside world.
Development: Baby gains about half a pound per week. Immune system is still strengthening.
Week 39: Full Term
Overview: Baby is fully developed and ready to be born.
Development: Baby’s brain and lungs are now fully mature. Placenta begins aging.
Week 40: Due Date!
Overview: You’ve reached the finish line!
Development: Baby may weigh 6–9 pounds and measure around 20 inches. Delivery can happen anytime!
Disclaimer: This calculator is for informational purposes only and should not replace professional medical advice. Always consult your healthcare provider for personal guidance and diagnosis.