How Big Is a Baby at 12 Weeks Pregnant?

In the 12th week of pregnancy, you're reaching the end of your first trimester. Even as your pregnancy symptoms diminish, your baby is still doing a lot of growing.

  1. Length

    • Your baby is approximately 2 inches long this week, give or a take a few tenths of an inch. This measurement doesn't include her legs, which are still curled up against her body.

    Weight

    • It may not seem like much, but your baby weighs in at half an ounce. Considering he was a single cell only 12 weeks ago, that's quite an increase.

    Appearance

    • No longer an indistinguishable embryo, your baby's face has taken form and she clearly looks human. Her eyes can open and have moved to the right place on her skull, her fingers and toes have formed and her ears are starting to take shape.

    Reflexes

    • Your baby is developing his most basic reflexes this week, including suckling, blinking and startling. Loud noises, bright lights and even a poke to the belly will elicit a response.

    Brain and Organ Development

    • To accommodate the new reflexes, your baby's brain is increasing in size and function. She can recognize and respond to many stimuli, and many of her bodily functions, including digestion, are beginning to work.

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