Weekly Fetal Development

Weekly Fetal Development

Week 4-5: The Beginning

At the beginning of your pregnancy, your baby is just a tiny ball of cells. By the end of week 4, the embryo has implanted into the lining of your uterus. The neural tube, which will eventually become the brain and spinal cord, is forming.

Week 4-5: The Beginning

Week 6-7: The Heartbeat

By week 6, your baby’s heart is beating and blood is beginning to flow through the circulatory system. The fingers and toes are beginning to form, and the eyes are beginning to develop. By week 7, your baby is about the size of a blueberry.

Week 6-7: The Heartbeat

Week 8-9: Major Organs

By week 8, all major organs have begun to form. The baby is now called a fetus. The head is still larger than the body, but the arms and legs are beginning to lengthen. By week 9, the baby’s eyelids are forming and the ears are moving into place.

Week 8-9: Major Organs

Week 10-11: Growing Rapidly

By week 10, the baby is growing rapidly and is about the size of a strawberry. The fingers and toes are no longer webbed, and the baby can move them. By week 11, the baby is about the size of a lime and is growing hair, nails, and teeth.

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Week 10-11: Growing Rapidly

Week 12-13: Gender Reveal

By week 12, the baby has all of its organs and is about the size of a plum. The baby can now suck its thumb and make facial expressions. By week 13, the baby’s gender can usually be determined through an ultrasound.

Week 12-13: Gender Reveal

Week 14-15: Growing Hair

By week 14, the baby is about the size of a lemon and is growing hair on its head. The baby is also beginning to produce urine, which is released into the amniotic fluid. By week 15, the baby is about the size of an apple and can make facial expressions.

Week 14-15: Growing Hair

Week 16-17: Movement

By week 16, the baby is about the size of an avocado and is beginning to move around more. The baby can also hear sounds, including your voice. By week 17, the baby is about the size of a pear and can make sucking and swallowing movements.

Week 16-17: Movement

Week 18-19: Taste Buds

By week 18, the baby is about the size of a sweet potato and is developing taste buds. The baby can also hiccup and may startle in response to loud noises. By week 19, the baby is about the size of a mango and is covered in vernix, a waxy substance that protects the skin.

Week 18-19: Taste Buds

Week 20-21: Halfway There

By week 20, the baby is about the size of a banana and is halfway through the pregnancy. The baby can now hear your heartbeat and the sound of blood flowing through the placenta. By week 21, the baby is about the size of a pomegranate and is developing more fat under the skin.

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Week 20-21: Halfway There

Week 22-23: Rapid Brain Development

By week 22, the baby is about the size of a spaghetti squash and is growing rapidly. The baby’s brain development is also rapidly advancing. By week 23, the baby is about the size of a grapefruit and can hear more sounds, including your voice and music.

Week 22-23: Rapid Brain Development

Week 24-25: Breathing Practice

By week 24, the baby is about the size of an ear of corn and is practicing breathing movements. The baby’s lungs are not yet mature, but this practice helps to prepare them for breathing outside of the womb. By week 25, the baby is about the size of a rutabaga and is developing more complex sleep patterns.

Week 24-25: Breathing Practice

Week 26-27: Senses

By week 26, the baby is about the size of a head of lettuce and is developing more advanced senses, including vision and touch. The baby’s eyes can now open and close. By week 27, the baby is about the size of a cauliflower and is gaining weight quickly.

Week 26-27: Senses

Week 28-29: Kicking

By week 28, the baby is about the size of an eggplant and is kicking and moving around more frequently. The baby’s hair is also growing longer. By week 29, the baby is about the size of a butternut squash and is beginning to turn into the head-down position in preparation for birth.

Week 28-29: Kicking

Week 30-31: Eyes Open

By week 30, the baby is about the size of a large cabbage and is opening and closing its eyes. The baby’s bones are also hardening. By week 31, the baby is about the size of a coconut and is developing more fat under the skin.

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Week 30-31: Eyes Open

Week 32-33: Getting Ready

By week 32, the baby is about the size of a jicama and is getting ready for birth. The baby’s digestive system is developing and the lungs are maturing. By week 33, the baby is about the size of a pineapple and is practicing breathing movements more frequently.

Week 32-33: Getting Ready

Week 34-35: Growing Rapidly

By week 34, the baby is about the size of a cantaloupe and is growing rapidly. The baby’s movements may be more restricted due to lack of space in the uterus. By week 35, the baby is about the size of a honeydew melon and is gaining about half a pound per week.

Week 34-35: Growing Rapidly

Week 36-37: Final Preparations

By week 36, the baby is about the size

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By administrator

I am a child development specialist with a strong passion for helping parents navigate the exciting and sometimes challenging journey of raising a child. Through my website, I aim to provide parents with practical advice and reliable information on topics such as infant sleep, feeding, cognitive and physical development, and much more. As a mother of two young children myself, I understand the joys and struggles of parenting and am committed to supporting other parents on their journey.

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