At 4 weeks gestational age, a baby in the first trimester starts to grow a brain, spinal cord, and heart. Arm and leg buds begin to form. The baby is considered an embryo at this point and is 1/25 of an inch long.

Feb 21, 2023 · Follow your baby's development week by week, from conception to labor, in these amazingly detailed, doctor-reviewed images. At the start of this week, you ovulate. Your egg is fertilized 12 to 24 hours later if a sperm penetrates it.

May 3, 2022 · See how your baby is developing in each week of pregnancy with these ultrasound images, from weeks four to 40. Scan photos are so precious during pregnancy – it's wonderful to see your baby growing and ultrasound pictures can be lovely keepsakes.

First Trimester: The Baby at 4 Weeks Your baby's brain and spinal cord have begun to form. The heart begins to form. Arm and leg buds appear. Your baby is now an embryo and 1/25 of an inch long.

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All ages referenced to fertilization, not last menstrual period.

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By week 4 of your pregnancy, the little ball of cells in your womb (uterus) has grown into an embryo. Although it’s only the size of a poppy seed, a lot is happening. The epiblast, which will go on to form your entire baby.

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