Rosie's Mummy
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I just read this at babycentre.co.uk and it totally blew me away - how incredible is the human body?! 
You may not look pregnant at this point but your babys heart, no bigger than a poppyseed, has already begun to beat and pump blood. The heart is dividing into chambers and will find a more regular rhythm soon. Your baby is about a quarter of a centimetre long and looks more like a tadpole than a human. He undergoes a growth spurt this week.
Major organs, including the kidneys and liver, begin to grow. The neural tube, which connects the brain and spinal cord, will close this week. Your babys upper and lower limb buds begin to sprout these will form your baby's arms and legs. The intestines are developing and the appendix is in place.
Below the opening that will later form your baby's mouth, small folds exist where the neck and the lower jaw eventually develop. As early as this week, facial features are forming. Nostrils are becoming distinct and the earliest version of the part of the eyes that is sensitive to light (retinas) are forming.

You may not look pregnant at this point but your babys heart, no bigger than a poppyseed, has already begun to beat and pump blood. The heart is dividing into chambers and will find a more regular rhythm soon. Your baby is about a quarter of a centimetre long and looks more like a tadpole than a human. He undergoes a growth spurt this week.
Major organs, including the kidneys and liver, begin to grow. The neural tube, which connects the brain and spinal cord, will close this week. Your babys upper and lower limb buds begin to sprout these will form your baby's arms and legs. The intestines are developing and the appendix is in place.
Below the opening that will later form your baby's mouth, small folds exist where the neck and the lower jaw eventually develop. As early as this week, facial features are forming. Nostrils are becoming distinct and the earliest version of the part of the eyes that is sensitive to light (retinas) are forming.