Weeks 1 to 4 – Poppy Seed
During weeks 1–4, implantation occurs and early development begins. Pregnancy tests may detect rising hCG levels as the embryo, about the size of a poppy seed, attaches to the uterus.
Week 5 – Apple Seed
At 5 weeks, your baby is about the size of an apple seed. The heart begins beating, the brain starts developing, and the foundations of the major organ systems are forming.
Week 6 – Sweet Pea
At 6 weeks, your baby is growing rapidly. The central nervous system, eyes, arms, and legs are developing, and the heartbeat may be visible during an ultrasound.
Week 7 – Blueberry
At 7 weeks, your baby is about the size of a blueberry. The heart is beating, blood is forming, and the reproductive organs are beginning to develop.
Week 8 – Raspberry
At 8 weeks, your baby is about the size of a raspberry. Fingers, elbows, lungs, eyelids, taste buds, and early teeth are beginning to develop.
Week 9 – Green Olive
At 9 weeks, your baby is about the size of a green olive. The ears, nose, limbs, fingers, bones, and eyes continue developing rapidly.
Week 10 – Kumquat
At 10 weeks, your baby is about the size of a kumquat. The brain is growing rapidly while the arms, legs, fingers, toes, and ears continue developing.
Week 11 – Lime
At 11 weeks, your baby is about the size of a lime. Major organ systems are present, and the baby can yawn, suck, and begin producing urine.
Week 14 – Nectarine
At 14 weeks, your baby is about the size of a nectarine. The baby can swallow, move, suck a thumb, and begin growing fingernails and toenails.
Week 16 – Avocado
At 16 weeks, your baby is about the size of an avocado. The heart is working steadily, movement is becoming coordinated, and an ultrasound may reveal the baby’s sex.
Week 18 – Bell Pepper
At 18 weeks, your baby is about the size of a bell pepper. The skeleton is hardening, reflexes are developing, and unique fingerprints and toeprints have formed.
Week 20 – Artichoke
At 20 weeks, your baby is about the size of an artichoke. The baby has established sleeping patterns, continues growing, and may weigh approximately 11 ounces.
Week 22 – Papaya
At 22 weeks, your baby is about the size of a papaya. Hair is visible, the baby weighs about one pound, and development continues throughout the second trimester.
Week 24 – Ear of Corn
At 24 weeks, your baby is about the size of an ear of corn. Hearing is developing, breathing practice continues, and rapid eye movements may occur during sleep.
Week 26 – Head of Lettuce
At 26 weeks, your baby is about the size of a head of lettuce. The eyes respond to light, hearing improves, and eyelashes, eyebrows, and hair continue growing.
Week 28 – Eggplant
At 28 weeks, your baby is about the size of an eggplant. The brain can coordinate breathing and body temperature while the baby continues gaining weight.
Week 34 – Butternut Squash
At 34 weeks, your baby is about the size of a butternut squash. The eyes, hair, and nails are well developed while the lungs continue maturing.
Week 40 – Watermelon
At 40 weeks, your baby is about the size of a watermelon. Most babies are positioned head-down and weigh approximately seven to eight pounds as birth approaches.