How Big is Your Baby This Week?

Wondering how big your baby is right now? He starts out the size of a tiny poppy seed and grows to the size of a pumpkin! Find out his approximate weight and length with our week-by-week averages.

By Julie Knapp

baby grows from sesame seed to pumpkin in size

iStockphoto

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Weeks 1 & 2

At this stage, your baby is just a tiny egg waiting to unite with a sperm.

Your pregnancy countdown has begun, but your baby doesn't exist yet. Confused? Your pregnancy is calculated from the first day of your last menstrual period, but your baby won't actually be conceived until around the end of week two when ovulation occurs. Then once your egg is fertilized by sperm it will begin to divide, doubling in size every 12 hours -- yet still remaining miniscule -- until it reaches the uterus for implantation. Then the amazing journey of your baby's growth and development begins.

See more about Week 1 of your pregnancy.

See more about Week 2 of your pregnancy.

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