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Your unborn baby's development, 13-28 weeks

Your unborn baby's development, 13-28 weeks


Weeks 13 to 28 represent the 2nd trimester of pregnancy. By the start of the 13th week, most of your baby's organs are either formed, or well on the way. During the following months your baby's main task is to mature and grow bigger and stronger until he or she can survive on their own after birth.

After 20 weeks, your baby is legally regarded as a person (in Australia), yet if they are born this early, they would not survive. Medical advances have saved premature babies as young as 24 weeks, but their chances of survival are greatly enhanced if born after 28 weeks.

During the middle months of pregnancy the threat of miscarriage now subsides, as does many of the early physical signs of pregnancy (such as tiredness and morning sickness) and the woman's belly noticeably swells to accommodate the life within her.

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The following is a summary of the miracle that is unfolding within your body (or within your partner's body) and how your baby is developing during the middle months of the pregnancy.

NOTE: This pregnancy time scale is marked by 'completed weeks of pregnancy' but we have also stated the start of each week, because we describe what your baby will do over the following week. For example, if you are 27 weeks pregnant, you are at the start of week 28. Bear in mind that these descriptions are just a guide and your baby may not be at the exact described stage during each specified week. Every woman and her baby are different and the range of 'normal' is variable. Also, after 13 weeks, your baby's physical changes are less noticeable on a weekly basis, so we have moved into changes that are happening over each fortnight.

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