At 33 weeks your baby is more than 17 inches from head to toe, and weighs a little over 4 pounds(about the size of a pineapple or as big as celery).
Your baby is rapidly losing that wrinkled, alien look and it's skeleton is hardening. The bones in it's skull aren't fused together, which allows them to move and slightly overlap, making it easier for baby to fit through the birth canal. These bones don't entirely fuse until early adulthood, so they can grow as baby’s brain and other tissue expands during infancy and childhood. Your little one acting more and more like a baby, with its eyes closing during sleep and opening while awake. And because those uterine walls are becoming thinner, more light penetrates the womb, helping your baby differentiate between day and night. Your baby has now got its own immune system. Antibodies are being passed from you to your little one as it continues to develop its fetal immune system, which will come in handy once baby's outside the womb and fending off all sorts of germs.
Note: Every baby develops a little differently — even in the womb. This information is to give you a general idea of your baby's size.
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