thebump.com:With bones and cartilage starting to form and vital organs beginning to function, baby is making major progress. Body length will almost double in the next three weeks, and arm joints are now working. (Soon, legs will too.)
fitpregnancy.com:
Your baby is about 1 1/2 to 2 1/2 inches long and weighs about a third of an ounce, the size of a peanut. This is a big week for your baby's growth—she'll double in height. At the end of the week, her head and body will be roughly equal in length. This week also starts an active phase for her - she can turn somersaults, roll over, flex her fingers, hiccup, and stretch. You won't be able to feel her movement for another month and a half. She's floating in lots of amniotic fluid. Her limbs are developing from webbed paddles into arms and legs that have well-defined fingers and toes. Fingernails, toenails, and hair follicles are also beginning to form. Your baby's testes or ovaries have developed, though the sex probably won't be visible on a sonogram for at least another month. Intestines have developed at the place where the umbilical cord meets your baby's body. The intestines are now able to make constricting movements, though there won't be anything to digest until later.
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