17 weeks:
Your Baby
Like an onion, your baby's organs and networs are full of layers. Existing structures become more developed. As his body straightens, his kidneys move into place. The heart circulates blood while the placenta carries out respiration, digestion, and waste removal. After birth, these duties will be performed by the lungs, digestive system, and kidneys.
Your Body
Your nose may feel stuffy or congested and your mucous membranes may swell, making it harder for you to breathe. Due to changing hormone levels, allergy symptoms may feel worse.
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